Current user in custom action w/o needing relation

Hi, I have tables that have row owners, and others that are available to all users.

For a table that is available to all users, establishing a relation using a user-specific field just seems like overkill.

I’d like the row of the currently signed-in user available in custom actions w/o having to set up a single-use relation like I had to do here (because I need this in all my tables).