The question is simple:
How to change save game location to custom directory?
I am trying to make Hacknet save/read save files to specified directory instead of the default one.
How do you do it if it's possible?

If on Windows: make a junction with the name of the currently used directory, pointing to the one you want to use.

https://docs.microsoft.com/en-us/windows/win32/fileio/hard-links-and-junctions#junctions

https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/mklink

The game will continue to work as usual, without noticing any changes, but the files will be where you want them.