Any way to set a static label for output arrows in Switch node?

It’s always 0,1,2,3 but I would like for example to set “no-error”, “client-error”, “server-error” (static values) etc … just to increase the WF readability

No sorry, that is currently sadly not possible. I moved it over to Feature Request.

Great jan! And more, this avoid looking again and again inside Switch node which value (string here for me) matches this number when creating ouput action nodes.

Yes makes total sense.