Alright, to give a little more context.
I currently have a situation where multiple fields (all with various types, inside structures and outside structures) have a relationship to eachother. Depending on one input, the recommendation of another field changes.
I can give a full documentation of all those relationships (meaning a full page of explanation for a full page of settings). That documentation will defenitly be somewhere, but to make it more usable for an end-user I thought of adding ‘checks’ which notifies the user if they specified values which are not recommended for the current relationship.
I know the Query language is a thing, so is there a way to use that for a ‘when-like’ blueprint parameter? I don’t mind adding custom methods via plugins declarations etc. but I would prefer not to use custom fields if possible. That is why I asked about alternatives to this (non-existing?) mechanic