This library is based on BotW and TotK, neither of which have parameters on the entry points.

Unfortunately, I don't have ACNH so, unless you know of another game that uses these, I will not be able to implement this.

No idea if there is another game that uses it but seems I have found the implementation:
https://github.com/asteriation/acnh-eventflow-decompiler/blob/master/decompiler/bfevfl.py#L332

It doesn't look complicated, but without a file I won't be able to test it anyway.

Seems I've just skipped reading those fields, so if I can get a test file it should be fairly simple to implement.

https://github.com/NCF-Library/BfevLibrary/blob/master/src/Core/EntryPoint.cs#L20-L22

Sorry for the delay, I haven't seen it before. Here is a test file if you want to test:
AI_NPC_Common.zip

Thanks, I'll look into it when I have some free time.

Just did some tests trying to implement and discovered that this file actually don't have any entrypoint with VariableDef (?)

Seems aster used the SubFlows to get parameters that are not defined in the entrypoint
https://github.com/asteriation/acnh-eventflow-decompiler/blob/95f33afe29572649d94b820128d54b5026e1b191/decompiler/cfg.py#L69

This one does have entrypoint parameters (in the slo_SellWeed entrypoint)
SNPC_slo_00_Peddling.zip