What is the explanation of why my JSON object is not being defined?

Question

I have had a look at the following questions, with negative results:

• I'm not quite understanding this asynchronous nature
• Javascript asynchronous nature
• Why is the object not being updated

My question was labeled as being a duplicate of, or having answers in, this, but it's absolutely not because the same issue is seen in Firefox - not a webkit issue.

The short version is that I thought to define all my JS functions in one file, and essentially use all my calls and eventlisteners in another file, loaded at the end and encapsulated in a .ready() function.

Let's say that in file_01.js, I have a this function:

function load_some_data() {
    let results_json = {};
    let query_string_objects = {
        this_thing: "query_string_one...",
        that_thing: "query_string_two...",
        the_other_thing: "query_string_three...",
    }
    for (let some_thing in query_string_objects) {
        $.ajax({
            method: "GET",
            data: query_string_objects[some_thing],
            url: "./query_processor.php",
            success: get_results,
        });
        function get_results(results) {
            results_json[some_thing] = (JSON.parse(results));
        }
    }
    console.log('Within load_some_data: ');
    console.log(results_json);
    return results_json;       
}

then in file_02.js, let's say I have this:

$( document ).ready(function() {
    let stored_data = load_some_data();
    console.log('After function call and assignment: ');
    console.log(stored_data);
    console.log(stored_data.this_thing);
});

And the output/access is confusing to me. I understand clearly why the console statements appear how they do: inside the function rendering first then after from the file_02 console.log statement. But why are the JSON objects empty until I click to expand the object and then there comes that statement: 'This value was evaluated....'?

I am including the phenomenon in Firefox as well. Additionally I have tested the syntax of the console.log(stored_data.this_thing);, with console.log(stored_data[this_thing]); and console.log(stored_data['this_thing']); with the same result.

The error below the console outputs, seen/experienced is unrelated - it's a ChartJs config thing I am getting wrong.