How to create time signature of 3/1

I’m mocking a Bach chorale that starts in 4/4 and switches to 3/1, but I can’t find a way to select/create the 3/1 time signature. 3/2 is offered, but no cigar. Ideas or workarounds? Thanks.

Since it’s just a mock-up… the beat/meter just needs to be the same math. Use 6/2. It’s the same number of divisions and will keep the beat aligned.