How to raise the server inside the connection?

Question

C++ / C#

Good evening!
I took the code exactly from the boost documentation https://www.boost.org/doc/libs/1_77_0/doc/html/boo...
I need to modify it so that from the do_read() function I can raise the second server on an arbitrary port , which could then turn itself off and report this to the connection from which it was called.
Unfortunately, you cannot add a server to an io_context that is already running.
I also tried to create a server with a new instance of io_context in another thread, but it didn't work either.