This is gold, thank you very much!

For newcomers, in the newer PyCharm the 2nd part isn't necessary anymore since it can parse .ssh/config directly. Just one detail: such login requires authentication to for the cluster and the node hosts while PyCharm can do only one level. The solution for this is for example specifying IdentityFile path in .ssh/confile for the cluster host and the login credentials for the node straight in SSH configuration in PyCharm.