Storing without Indexing?

We would like to have some fields which are only stored (some data is only used for displaying stuff in the frontend and doesn't need to be searched in).

I couldn't find a way in the schema to tell that a field should only be stored.

Is there some workaround ?

I guess what you are looking for is this

But this is not applicable in AppSearch right?

I am looking for a solution that works with AppSearch

Oh sorry.. didn't get that this was an AppSearch question.
What about the search_fields Parameter in the query?

This would still mean that the data gets indexed and with it larger index sizes.
Additionally I want to receive the data, but I don't want AppSearch to search in it.

I have a huge problem with the index size + performance, which I described here: