How to add objects (lines and text) to a Button Matrix?

Description

Is that possible to add lines and a label inside a btnmatrix like the violet ones on the picture below?

What MCU/Processor/Board and compiler are you using?

Simulator

What LVGL version are you using?

8.3

What do you want to achieve?

What have you tried so far?

Code to reproduce

Screenshot and/or video

Hello,
I think it might be easier to make that voice selector header portion a different set of objects altogether, and to place the rest of the buttons in a button matrix under that.
It might be possible by changing the draw function but one of the problems with the button matrix is that the height cannot be changed per row of buttons (as far as I am aware) so it will still not look right.