How do I fill many instance variables with automated action?

Hello. I have a family class containing about 50 instance variables and several dictionaries with accordable pairs "variable name":"value".

I could create a function to manually apply each variable with 50 single actions, but that's very consuming, inconvenient and may cause errors, i.e. if I change family variable name and forget to fix key string.

Is there any way to transfer data from a dictionary, array or maybe JSON string automatically? Like "for each variable" action or something.

Here's example of what I need:

Just found out about "Set from JSON" action to determine object's state but couldn't get any documentation or explanations. Can it be used to assign variables only?