Add custom kanban group by relation

What Do You Recommend?

Ability to add custom group by value in kanban view.
This has been discussed in various topics on this forum, from my understanding it’s not currently possible to do this. However one user seems to be able to do that, as mentioned here:

How Could It Be Done?

I’m not a software engineer, so I don’t know

Real World Use-Cases

For me, it would be to have a set of tasks and then group those tasks in kanban view by a relation of “linked projects”. This way it would be very nice to have an overview of all the projects and their associated tasks.