Unfortunately, I think the only people who can answer your question is Fandom staff. It looks like Fandom is still using its own version of the extension so it depends on whatever that version is capable of. If the UCP codebase were open, one could go in and check but it isn't. Not that it help's but the MediaWiki Foundation version (derived from Fandom's) does support lists already. I tried it just to check but no luck.