I know glitch does have markdown support. Not sure about the rest. You’d have to create an account on one of those other instances to see. At the very least they should probably be able to see all those markdown characters.
Actually, I just checked. Pleroma should have similar markdown support. Misskey has maybe their own flavor of markdown support so not sure how compatible it is (but they have a shitton of other feature that nobody else has).
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