[Feature Request] "Custom Node" creation by bundling multiple nodes in its own subspace

Heyho,
I couldn't find a request like that, so I do it now: how about adding a feature similar to Matlab/Simulink graph nodes, where you can select multiple nodes and combine them into a "custom node"?
If you then double click this custom node it opens up a subspace where you only see the formerly selected nodes together with their connections.

The in- and output of that custom node simply could be defined by any unconnected in- and output of the selected nodes.
I think it could be quite helpful for more "static" workflows like hires-fix or upscaling. I blieve it's usually like that one sets those up and keeps those settings mostly the same for different creations afterwards. If you could merge this setup into one node and name it "HiresFix" or whatever, this really could help to clean up the workflow