How to get a container shape to expand horizontally? (like class diagram but to the right)

[chipbite]

Hello!
The class diagram shape is really useful to put in other shapes and use how it is automatically expanding vertically / downwards.

I would like to do this, but horizontally - exactly the same, but as you add other shapes it expands horizontally / to the right.

Can this be done currently? Maybe another shape that does the same thing but horizontally?

Illustration, png with drawio embedded:

(png with drawio embedded)

So in the above, I would like for the boxes to expand to the right, red, blue, yellow - not stacked on top of each other.
I am after the easy way of adding new boxes (ctrl-enter).

Any tips?

Thanks!
BR! /marcus