Can I use a Relation to join a restaurant and its patio?

I've got a patio for a restaurant tagged as leisure=outdoor_seating. That page says you can add operator=* as a string, but I'm wondering if I can add a Relation between the patio and the restaurant. This is really for semantic reasons, because if the restaurant changes its name or gets a new owner, it would be nice if the patio didn't then have out-of-date information.

I don't see a Relation type that's relevant. I don't want to just start doing my own thing, so does anyone know of a way to use a Relation here, and if not, is that something that can be proposed?

Thanks for all of the responses on my other questions, btw. This community has been very helpful.