@omoigwa93 I have to admit that I don't know exactly what train model-door means but I assume we are talking about rectangles (or better boxes) with rounded corners.
Box and label annotations accept borderRadius option where you can set the rounded corner.

But if you need more complex shape to draw, I think the best option is to define a label annotation where the content is a canvas (or image) where you have the freedom to draw whatever you want.

If you can provide here an example about a train model-door shape you would like to have, I can try to help to design it.