I hope I’m not wrong, but I think that you’re asking in regards to your other post, namely Searchable and indexed Custom attributes
This does unfortunately fall outside of my expertise, so I would not be able to provide a clear answer, although Support will be able to provide a more detailed response as to what can and cannot be done.
If this is of great importance on your end, please send a DM ( Direct Message ) to @support and we can take the conversation from there.
Have a great one!
Gerald