5:6 tuplet instead of 5:3

Hi!
I'm writing in 9/8 (3+3+3) and I want to create a 5:6 16th note tuplet taking one beat. However, any method I've tried only creates 5:3 8th note tuplets which gives the impression that the notes are much longer than they really are. Even creating a custom 6/16 time signature and making the bar a tuplet using Ctrl+5 (as suggested here https://musescore.org/en/node/260646) still creates a 5:3 tuplet.

Is there any way to do this in MuseScore?