Water Plugin: Collision (Stepping onto) a "frozen" WaterBodyRiver/WaterMeshActor

Hi Dear Deverloper Community.
Does anyone know whether and if, how I could make my Water Plugin’s River (WaterBodyRiver actor) get collision in Blueprints? I want to make the river frozen and steppable in winter.
Is there a chance to enable/add simple collision in blueprint?

Since I am fairly new to C++ to do such (if that is possible) on the actor itself.
And it’s a pretty large open world river and modeling a collision plane is ;(( exhausting.
Very very thankful and with kind regards,