I wanted to ask if there is anything related to transfer ownership for Cairo 0, I just checked documentation and transfer ownership is available til Cairo 1. I dont know if this is feasible and/or recommended to implement from a security point of view of course.
Ohhh, sorry, I check the code, there is a file ownable.cairo which has supported two-step ownership transfer. The latest version is 0.17.0, you can install and have a try.