Did Jack Smith select the grand jurors; if so, they are all probably Democrat.
It wouldn’t be hard to find grand jurors even in Florida who are anti Trump, Smith would just make sure to ask “Are any of you right wingers, if you are you are OUT” that is what happened in NY, anyone even the slim chance of having a Republican on the grand jury they were quickly booted
The jury in the eventual trial will be in FLA, not DC.