Forms V2 - setFieldValues for dropdown or single choice

Question:
Hi, I am using a the new forms (v2). And I trying to inject value into a dropdown or a single choice element

Product:
Wix Editor

What are you trying to achieve:
I am collecting a local storage value that was set in a previous page.
And trying to dynamically set the value for either a dropdown or a “single choice” element

What have you already tried:
I was able to inject the value into a regular short input text box (it is different in Forms V2 - the new forms. but this works:

import { local } from "wix-storage-frontend";

$w.onReady(function () {
   
    let ref = local.getItem("my-data");
    console.log("I got " + ref)
    $w("#myForm").setFieldValues({
        myField1: ref,
    });
});

This worked, but due to the “closed” environment of the new Forms - I couldn’t find how to populate a dropdown or a single option.
BTW I do know the key of that drop down, I just don’t know how to access it.

Thanks
Gidon