Implementing SSH on platform using NET+OS 6.3

Hello. I need to implement an SSH server on our product which is using an ARM processor with NET+OS 6.3 RTOS (Thread-X based).
I understand there is no built-in support for SSH.

I wanted to use some standard open-source code like OpenSSH but I’m not sure it supports such an OS, and I was told the porting would be difficult.

I was wondering if such libraries already exist or if anyone has tips for me regarding how to approach the issue.