Help edit note heads

How to create or edit this type of note heads to use the names in Spanish “do, re, mi, fa, sol, la, si”

I only see the “Ti” and “G” options for the notes “B” and “G”
I need to put “Si” instead of “Ti” and “Sol” instead of “So”

I see si in the available notepads. Not sure about sol, as it’s three characters…

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Ok Si, but Sol instead So?