How do I create this kind of mesh/SubD which has undulation and inflated?

Hi there! I recently started using Rhino 7 and grasshopper, this kind of form is a first time for me. Any suggestions? Can I use kangaroo physics or any other plugins to achieve this form?
I tried randomly moving points on the surface but I need it to look organic and growth type.
Ignore the horizontal shelves I can later skrink wrap them once I get the organic form.

The mesh looks more like something created with some sort of randomness.

I don’t think you need Kangaroo to do that.