Question to fellow polyamory yumeshippers

So this isn’t specifically about people with multiple f/o’s but more so about people whose ship is like a triad(?)? For example oc/self-insert/sona/or so x canon x canon?

How common exactly is this because I am curious considering all of my yumes consist out of that dynamic because I still adore a lot of canon x canon pairings and think my ocs would be a fun fit into the dynamic.

I have’t really seen anyone else with dynamics like that, usually just people with multiple fictional others.