I don’t see anything particularly special about them in regards to depth (volume effects), so probably just noise in roughness, bump / normals on the surface will give you the same effect in almost all render engines.
However, if you do want depth effects, like cloudiness it’s a bit trickier in native C4D. It has Absorption via Transparency no problem but not volume scattering which would give the cloudiness. I’m sure some kind of approximation could be build via the nodes using Rays but not easily.
In the very distant past I would render a base beauty pass and then a volume light pass to fake the cloudiness effect. It was quite good but nothing like proper scattering.
I’m fairly sure all third party engines that come to mind all have some kind of scattering/absorption.