You can use whatever abbreviations you like, provided that you clearly define them. This is necessary when the general public does not know the abbreviation you are using (as I believe is likely to be the case here). Also, I think I would use the word « hereafter » rather than « hereinafter » when presenting an abbreviation, but perhaps English speakers from other countries would disagree.
« Hereafter », I might add, is not an everyday word at all, but it is commonly used in this context in academic, professional, and scholarly works. In other words, you might use it in the contexts where you don’t end sentences with prepositions and use « whom » instead of « who », but definitely not on Instagram or in a conversation with friends. (I’m sorry, I just couldn’t resist adding that after the last question I answered for you)! 😂