Within a ModalBottomSheetLayout, I want a TextFiel...

# compose

[allan.conda]

Within a ModalBottomSheetLayout, I want a TextField that is always shown at the bottom of the screen when this sheet is visible, regardless of the expand state. Only the rest of the content should scroll.
Is it possible to do this or would I need a custom layout to achieve this?
Currently the comment button only shows up when the sheet is fully expanded.