How to scale Render Target Resolution at runtime?

Hello,

I am trying to use an array of render target blueprints to create a water surface.
So for better performance I want to lower the scale of a render Target when the distance to my character gets bigger.

Unfortunately i found no way to do that on runtimeā€¦
I can create render target on runtime and set size but once they are created I dont have access to the size anymore :frowning: