#15 Chords - Is that possible?

How I can achieve chords like Cmaj9#15 or other variations?

Thanks!

Sounds like you want Cmaj9b9, 15 is equivalent to an octave.
Engraving options > chord symbols has several options to how you want it to appear.

I can’t sustitute #15 to b9 (Here some reasons: https://qr.ae/pswZ9V).
Also, I want to do it for education purposes.

Is there any way to achieve de 15 in chord symbols in Dorico?

I’ve always thought of it as Dmaj7/Cmaj7, or maybe Gmaj7(#11)/C, but Bud Powell uses that sound all through the melody to Un Poco Loco:

I’ve never seen it called Cmaj7(#15) before, but that certainly would be a reasonable alternative I guess. There’s not really any way to do it other than manually editing the symbol in engrave, or taking a suffix you aren’t going to use in the project and redefining it.

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