Ooof. Memory unlocked: As an only child staying at my great-grandmother's country home, I played through a series of "gamebooks" that added character stats, inventory and random rolls to the CYOA theme.

https://www.scribd.com/document/717863174/The-Way-of-the-Tig...

https://en.wikipedia.org/wiki/Way_of_the_Tiger

Similarly, I got one of https://en.wikipedia.org/wiki/Lone_Wolf_(gamebooks) from the public library once.