Learning a heritage language with native children’s textbooks?

I am an adult heritage speaker, and in terms of strictly foreign-language learning, my level in my heritage language is probably upper intermediate overall. My listening and reading comprehension are much better than my production.

Unfortunately, my gaps in knowledge don't seem to match up very well with learning progressions of textbooks aimed at foreign language learners. In a given unit or chapter, with some vocabulary or grammar I'm like, do they even need to teach this? And in that same unit or chapter, I will also encounter new concepts or at least concepts I'm not completely comfortable with.

I was thinking of using native children's textbooks to try and fill some gaps in my knowledge. Does anyone have any learning of teaching experience with using native children's textbooks for heritage speakers? Do these textbooks work at all for self-study, or are they only useful with some sort of guidance?

This is something that I plan on trying out regardless, but if anyone has experience or related anecdotes, I'd love to hear it.