More about update interaction via RESTfull API

On my interaction form I have some fields that links to variables (e.g. $my_var). The question Is how can i fill it through REST API request on update? If i try send smt. like 

{"$my.var":"important info"}

I have a message "Next variables skipped {"$my.var":"important info"}". I have tried write $my_var instead. Not working

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