SSH Bounce Host (ProxyCommand) Using ChromeOS

[x-post from /r/chromeos]

I have some VMs in my home network. On my Linux and Mac laptop I SSH to them through a bounce host using ProxyCommand in my ~/.ssh/config. Is there a way to replicate this (or imitate it) on ChromeOS using the SecureShell app?

ProxyCommand doesn't work directly (as best I can tell). I am using certificate authentication so I can't SSH into the bounce host and SSH from there without putting my certificate on the bounce host, which I want to avoid for security.

Here's what's in my ~/.ssh/config: "ProxyCommand ssh eldridgea@$BOUNCE_HOST_IP_ADDDRESS nc %h %p".

Apparently you can use the built in "relay options" which utilize websockets for a similar effect, but I cannot find documentation regarding how to set that up. I found a github project aiming to do this but it doesn't work and hasn't been updated in 2 years.

Any help would be really appreciated!