I have the configuration shown in the image.
I would like to know what settings I need to make so that the multicast packets that PC2 broadcasts reach PC1.

This is simply a test scenario I need, it is not at all particular.

I know I can set up the WiFi interfaces to work as repeaters and have the two PCs on the same network, but it doesn't work for what I need to test.

I need the receiver and sender of the multicast packets to be on different networks.