I don't know if there's such a thing as a "standard" jelly donut filler, but if you look at restaurant supply websites, you'll see this one pop up:
I'm sure it works fine, but I don't like the UI, where you have to stick the donut onto the sideways-protruding syringe. It seems brutish. I think a much better, and undoubtedly faster, design is this one:
Spotted (where else?) at r/specializedtools.
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I always wondered how they did that :-)