No way. DNS does not allow it.
SRV record is processed by the application, such as SIP server can query srv record of the domain and to find out where this domain has a sip server to connect to the call. Jabber as well.
The browser works over either port 80 or port 443, all other ports require an explicit Declaration in the URL.
Jannie.Connelly47 answered on June 3rd 19 at 19:21
SRV DNS record
Amir76 answered on June 3rd 19 at 19:23
to specify A-name to proxy nginx to redirect to the desired upstream