The usual suggestion is to download MusGlyphs and add this notation as system text.
q3= q

or 3q = q

I don’t think there’s a way to get two quarter rests under the tuplet bracket, but maybe someone else knows.
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Hi @Ted_Trobaugh, another way is to create this in Dorico, using a 0-line instrument, then export a slice, and create a Playing technique as Glyph with this graphic:
The exported SVG:
tuplet-quarter.svg.zip (2.0 KB)
Usage example:
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