Add own element to shortcode - safe way

Hello!
I have question, is there a safe way to add 1 field to Pricing box ?
Currently I added field manually in shortcodes files, but after next update it will be removed.

Is there a way to do it in safer way ? Or could you add field "data-product" so people would be able to use it with contact form ? 
I can share code how to do it :)

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