Plesk allows giving SSH access to the subscription user, but it will be limited only to the subscriptions that they manage, preventing them from causing any problems on the server.

To give SSH access to a specific user, we must access our Plesk panel, then access the Subscription we want, by clicking on Subscriptions, in the left sidebar

Once inside the subscription, you must access the Web Hosting Access option:

In this section, we have an option that is Access to the server via SSH, and in this dropdown, we will indicate /bin/bash (chrooted). Click on OK and save the changes.
This way we give SSH access to this user, by default our SSH port is 50050.