Can someone give me advice about a proxy?

Is there a way to set up a proxy for a wireless network so that you do not need to put a proxy address on every single laptop / phone?

It would be easiest to put the address and the port in the router but I can not find anything about this.

It’s about a company with 2 branches, one building gets internet from the other building via a proxy. The proxy is now set manually on all wired connected PCs.
It is now the intention to build a wireless network, but that proxy should actually be set in a router or something else so that you do not have to put the proxy address in every wireless connected device.

Does anyone have an idea how I can solve this?

Thanks in advance.