I have multiple domains set on a server.

Each domain is related to a specific server.

For example :

a.example.com > 192.168.1.10
b.example.com > 192.168.1.11
c.example.com > 192.168.1.12
d.example.com > 192.168.1.13

My clients send requests on ports 8080, 8081, 8082 and ETC and I need to proxy pass these requests to their specific server based on the domain.

as far as I know I cannot use server_name in nginx stream block.

how can I achive this ?