Option to disable iframe resizer in Forge Custom UI Modal

In my Forge app, I’d like to show some content inside a custom UI modal, with size: ‘max’, like this:

I just want my content to be as large as possible and fill that available space, without scrollbars.

However, with the iframe resize listener, I can’t find a way to achieve this, because if my content doesn’t have a fixed height, the iframe height will be zero.

Is here a way to turn off the iframe resize listener and fill all of the available space in the modal?