can RDM use SSH cert in ssh key credential in ssh connection?

for SSH cert-based auth, I got my public key signed by private CA on SSH server and install it to the ssh key credential (snap1.png)


in ssh session, there is no option to read the signed cert from the ssh key credential. The options File (local) and Embedded data works fine if I provide the signed public key. (snap2.png)

Please help to check if this request is fesible or not.

Regards,
Eric