When editing a TextField I would like to show a bubble at cursor position like

This is not possible right now.
This handle is represented by the TextFieldCursorHandle view.
For it to appear state.handleState must be equal to HandleState.Cursor.
At the moment this state is set only inside the tap handler.
All of these elements are private or internal, so you can't change this behavior.
I suggest you open feature request on the compose issue tracker.
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