By "Trump ballot" you mean the 2034 election? No matter whether it's a national or a local election, I don't think judges are ever "contested", as in both parties putting up a candidate for the same slot. I believe judges are supposed to be non-partisan, so you only get to vote "yes" to the ones you want, or no vote for any others running whom you don't want. Somebody correct me if I'm wrong about that.
I always check out the judges on the web. Even though they don't list a party on their web pages, you can usually tell which are Democrats by some of the items in their biographies or news stores. You can also check out their pictures for clues such as body language or attitude.
Pardon me: should read “2024 election” / typo