It isn't exactly East Asian, but have you tried Indian food? A lot of it is plant-based since many Indians are vegetarian, and being an Asian cuisine, many of the ingredients used are also similar/the same to those found in other Asian cuisines. This YouTube channel might be of some use - https://m.youtube.com/channel/UCDbZvuDA_tZ6XP5wKKFuemQ. If you're dead set on only cooking up East Asian style food though, maybe try this channel instead - https://m.youtube.com/user/marystestkitchen.