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There's a Patreon module which handles the thing, but you have to be subscribed to his patreon for it.
In addition to the R20Converter module mentioned by others, if you're doing commercially prewritten adventures there's now a module (in beta) that imports complete adventures from D&D Beyond into Foundry. It's also a paid Patreon subscription, but in principle you could get the $3 or $5 tier once and import all your adventures and then unsubscribe. If you got your prewritten adventures elsewhere or pre-wrote them yourself then this particular module won't do much for you.
Monster muncher and adventure muncher requires own ddb-proxy to run without patreon. I have committed Dockerfile that helps spin it up.