How to use Multiple SSH services reuse on the same port ?

I want to use multiple machine ssh service on same port using custom domains or subdomains?

Machine 1:
serverAddr = "x.x.x.x"
serverPort = 7000

[proxies]
name = "ssh1"
type = "tcpmux"
multiplexer = "httpconnect"
customDomains = ["machine-a.example.com"]
localIP = "127.0.0.1"
localPort = 22

Machine 2:
serverAddr = "x.x.x.x"
serverPort = 7000

[[proxies]]
name = "ssh2"
type = "tcpmux"
multiplexer = "httpconnect"
customDomains = ["machine-b.example.com"]
localIP = "127.0.0.1"
localPort = 22

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