zoomable map like Google maps

Hi everybody,

I started a discussion a few weeks days about the zoom of vector based elements – some things worked but there's one main problem left.

In my current project I need to find out how create a zoom like in this example of a map.

Here the continent is scaling while the typography has a consistent size at any zoom factor.

In my last discussion you helped me a lot with an expression but it's not working for this case. I have an example uploaded here that shows what I mean. The "pipe" outline keeps its size with the help of an expression although the camera is moving towards it. That works great.
For the "object" I cannot use the expression because it has different attributes. But it also should have the same size at any time. At the moment it's scaling The expression doesn't seem to work for vector based elements, could it be?

Can you please help me out? Would be so great!

Thanks for any help!