Composite Time Signature Help

Hello! I'm looking to add a composite time signature (I believe that's what they're called?) in musescore, in the manner of the attached screenshots. There is a section in the online manual about composite time signatures, but it doesn't seem to help my case much. In particular, I'm trying to get it to say "6/8+3/4" or "6/8(3/4)". I currently have my piece beamed appropriately, but I'm looking to see if there's a way to change the text of the time signature itself. Thank you!