Developing SDK(Library) for both IOS and Android

I would like to build an SDK(Library) which could be then integrated with every mobile technology and framework (IOS/Andorid) (Kotlin, Swift, Flutter, React-Native). I am trying to avoid developing this SDK two times, one for IOS and one for Android.

Do you think Kotlin Multiplatform is a good choice? When searching about developing and library, all I find is what is the best hybrid technology to develop a whole App and not just SDK. Maybe it does not have any difference.

Thank you!