Sounds like SVGs would work well for this.
The advantage of a COLR font over SVGs is that they are functionally identical for this use case (indeed, the font in question was converted from SVG vector files) and a good deal more compact to boot.
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The advantage of a COLR font over SVGs is that they are functionally identical for this use case (indeed, the font in question was converted from SVG vector files) and a good deal more compact to boot.