“Filter” custom parameter for subset of glyphs?

Sorry if this has been asked before but is it possible to apply a “Filter” custom parameter only to a specific set of glyphs instead of the whole font?

I am generating a customized style of one of my fonts specifically for a UI project and I want to space out the colon and period, and I’d rather not add an additional glyph to the source file only for this project.

Adding ...; include: a, b, c, d, e... does not work?

Excellent, thanks!

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