How i can change date format in python

Question

i need advice, how i can change date format in python We accept JSON request in like that - "27.07.2022" But i need change dates in Json files automaticaly like that - "2022-07-27" How i can do that, can you guys please help And please give answer for Python language

{
"discount": false,
"downpayment": 6.15,
"duration": 12,
"gosProgram": false,
"grace": false,
"instalmentDate": "27.07.2022",
"insurance": false,

}