Shell Function to get value of a property from YAML file

Question

I am trying to create a unix shell/bash function to get a specific value from a YAML file. I don't want to use Python/Ruby or other scripting languages or do not want to install any packages that are not natively available in bash. The function should take the property name name and yaml file name as input and return the value of the property.

Sample YAML is given below.

---
Action: start
Version: 642
Domains:
  Domain:
    Name: SanityTest
    AppSpaces:
      AppSpace:
        Name: SanityAppSpace
        AppNodes:
          AppNode:
            Name: SanityAppnode
            Applications:
              Application:
                Name: InstagramTest.application
                Version: "1.0"
          AppNode:
            Name: SanityAppnode_1
            Applications:
              Application:
                Name: InstagramTest.application
                Version: "1.0"

I am looking for some function that works like:

DomainName=getValue Domains_Domain[1]_Name /path/my_yaml.yml

AppSpaceName=getValue Domains_Domain[$DomainName]_AppSpaces_AppSpace[1]_Name /path/my_yaml.yml

AppNodeName=getValue Domains_Domain[$DomainName]_AppSpaces_AppSpace[$AppSpaceName]_AppNodes_AppNode[1]_Name /path/my_yaml.yml

AppName=getValue Domains_Domain[$DomainName]_AppSpaces_AppSpace[$AppSpaceName]_AppNodes_AppNode[$AppNodeName]_Applications_Application[1]_Name /path/my_yaml.yml

AppVersion=getValue Domains_Domain[$DomainName]_AppSpaces_AppSpace[$AppSpaceName]_AppNodes_AppNode[$AppNodeName]_Applications_Application[$AppName]_Version /path/my_yaml.yml

I came up with the below code so far, but it is not working as expected. Appreciate any help. Please advise if my approach is wrong and if there is better way.

function getValue {
    local ymlFile=$2
    local Property=$1
    
    IFS='_' read -r -a props_tokens <<< "${Property}"
    
    local props_index=0
    echo "${props_tokens[props_index]}"
    
    CheckingFor="Domains"
    currEntity_Index=0
    
    while IFS= read -r line; do
        curr_prop="${props_tokens[props_index]}"
        curr_prop_Index=0
        
        IFS=':' read -r -a curr_line_props <<< "${line}"
        curr_line_prop = ${curr_line_props[0]}
        
        if [ "${props_tokens[props_index]}" == *"["*"]"* ]
        then
            IFS='[' read -r -a prop_tokens <<< "${props_tokens[props_index]}"
            curr_prop=${prop_tokens[0]}
            curr_prop_Index=${prop_tokens[1]::-1}
            
            echo "Index processed"
            echo $curr_prop
            echo $curr_prop_Index
        else echo "No Index for this property"
        fi
        
        if [ "$curr_line_prop" != "$CheckingFor" ]
        then continue
        fi
        
        if [ "|Action|Name|Version|" == *"$curr_prop"* ]
        then
            return curr_line_props[1]
        fi
        
        if [ "$curr_prop" == "$CheckingFor" ]
        then
            if [ "|Domains|AppSpaces|AppNodes|Applications|" == *"$curr_prop"* ]
            then
                props_index++
                case $CheckingFor in
                    Domains)
                        CheckingFor="Domain";;
                    Domain)
                        CheckingFor="AppSpaces";;
                    AppSpaces)
                        CheckingFor="AppSpace";;
                    AppSpace)
                        CheckingFor="AppNodes";;
                    AppNodes)
                        CheckingFor="AppNode";;
                    AppNode)
                        CheckingFor="Applications";;
                    Applications)
                        CheckingFor="Application";;
                    *) echo "$curr_prop - not switched";;
                esac
                continue
            else
                if [ "$curr_prop_Index" == 0 ]
                then
                    case $CheckingFor in
                        Domains)
                            CheckingFor="Domain";;
                        Domain)
                            CheckingFor="AppSpaces";;
                        AppSpaces)
                            CheckingFor="AppSpace";;
                        AppSpace)
                            CheckingFor="AppNodes";;
                        AppNodes)
                            CheckingFor="AppNode";;
                        AppNode)
                            CheckingFor="Applications";;
                        Applications)
                            CheckingFor="Application";;
                        *) echo "$curr_prop - not switched";;
                    esac
                    props_index++
                    continue
                else
                    Integer_regex='^[0-9]+$'
                    if [[ $curr_prop_Index =~ $Integer_regex ]]
                    then
                        # Iterate until we get to the nth Item
                        currEntity_Index++
                        if [ $currEntity_Index == $curr_prop_Index ]
                        then
                            case $CheckingFor in
                                Domains)
                                    CheckingFor="Domain";;
                                Domain)
                                    CheckingFor="AppSpaces";;
                                AppSpaces)
                                    CheckingFor="AppSpace";;
                                AppSpace)
                                    CheckingFor="AppNodes";;
                                AppNodes)
                                    CheckingFor="AppNode";;
                                AppNode)
                                    CheckingFor="Applications";;
                                Applications)
                                    CheckingFor="Application";;
                                *) echo "$curr_prop - not switched";;
                            esac
                            currEntity_Index=0
                        else
                        fi
                        props_index++
                        continue
                    else
                        # Iterate until the name of the entity match and continue with next property token
                        # How to handle if the search sipllied into next object?
                    fi
                fi
            fi
        else
            props_index++
            continue
        fi
    done < $ymlFile
    return "${props_tokens[props_index]}"
}