How can I define a format set for an Opentype font myself?

[Andrea65]

Hi group, I want to define an own format set under character format -> open type features -> format sets, because the default ones are not sufficient. For example I want to have a question mark always with a round dot.
Is that possible? And if so, how?
My text was translated from German with deepl.

Thanks!

[Monika Gause]

You can't.

This has to be built into the font.

If you want to edit this stuff you need a permission by the copyright holder of the font and a font editing app that is capable of making the format sets.

[Andrea65]

Sorry, it was a misunderstanding. I mean a format set for glyphs present in the glyph set. For example, in the font Helvetica Now (Opentype) the square colon should be permanently replaced by a round colon.

With the function Search - Replace this is possible, but I want to specify it in the character format, many glyphs are to be replaced.

[Monika Gause]

Unless it can be specified with OpenType options into a character style, you can't do that either. It has to be built into the font.