Searches including 'Contained in' relationship

Is there a way to search which includes the 'Contained in' relationship? I've been playing around with TinyCat for personal use (basically searching my catalogue on my phone) and noticed it doesn't include omnibuses with 'contained in' relationships. So if I search a title included in an omnibus, it doesn't come up. It also doesn't return anything on the main site search.

It strikes me that is not desirable behaviour when one is mulling over a purchase decision - if I have an omnibus (especially as a print book) I don't want to repurchase the individual titles. (eBooks I split into the individual volumes, obviously I don't with print books.)

I could add the individual volumes to 'Read but not owned' or create an omnibus collection, but it's more work, especially when it comes to short stories in anthologies and collections. (The example here is Mimsy Were the Borogroves which I don't have as a standalone story as it's not on Faded Page, but I have it in various anthologies.)

There's a long-standing RSI to make the contained-in relationship more useful. Another example would be to not recommend works which you already have inside an omnibus