Function str_to_var 

pub fn str_to_var(string: impl AsArg<GString>) -> Variant

Converts a formatted string that was returned by [method var_to_str] to the original Variant.

var data = '{ "a": 1, "b": 2 }' # data is a String
var dict = str_to_var(data)     # dict is a Dictionary
print(dict["a"])                # Prints 1