The attached jpg shows the symbol I created for minor-major seventh chords - a triangle above a minus sign.
It’s used by Mark Levine in “The Jazz Theory Book”.
Before making it, I checked Engraving Options > Chord Symbols, and didn’t see it. If I missed something, please let me know.
I’m grateful for Dorico’s chord symbol editor, but since this book widely used in jazz education and highly acclaimed, IMO this symbol should be coded in as an option.
I like it because the stacked elements take up less horizontal space. And, like with ø instead of mi7(b5), once you know what it means, it’s more concise than mi(#7), mi(ma7), etc.