What kinds of macros should Scala 3 support?

Language Design
41

I agree with you.

I think it would be great if Scala 3 has ability to do it with black box macros.

May be It can be done with something like:
Pre-SIP: export, dual* of import

@RpcProxy
class  SomeThingProxy extend SomeThing{
  //Generate empty method for black box macros. 
  export SomeThing
}