The new

BasicTextField2

will keep the styles when editing content?

Do you mean multistyle text editing where AnnotatedString SpanStyles are not lost after each edit?

Yes , I want to know if that feature is on the roadmap

Yep it's definitely on the roadmap. It was one of the major criteria that we have taken into account while deciding the new API shape.

Where can I post suggestions for the component?

The official issue tracker component for compose. You can submit bugs, feature requests, and feedback.