Don't render an Area behind a plane

Hey, so I am trying to make everything, that is behind this green plane, to not render. I want to make use of the "use transparency" feature in OBS when capturing the game and I need this segment to be transparent and with visible things hovering in front of it(i.e. the ghost). When i use a greenscreen(material) and add a chromakey filter, it doesn't look quite right so I thought there might be a different way to archieve what i need.

So, my questions is: is there a way to not render the things that are behind this wall? The things in the front and on the sides must be seen, the background has to be the skybox or sth, so it can be made transparent when capturing in obs.

Please let me know what solutions there are available! It will probably be something with Shaders and I don't know any C++ or shader logic but I'd be invested in learning this if it's the only solution. Would prefer something not-shader related tho.

Than you!