Targets to match one tag out of multiple

[mlabbe]

Is your feature request related to a problem? Please describe

I have a project with tag 'a' and a second project with tag 'b'. Is it possible to create a target with tags where if either 'a' OR 'b' is matched, then the task runs?

projects:
  proj_a:
    tags: [a]

  proj_b:
    tags: [b]

targets:
  a_or_b:
    tags: [a, b]

tasks:
  some_task:
    target:
      tags: [a, b]  

In this situation, mani run some_task says "no targets". This is because the projects only have one of the two tags.

Describe the solution you'd like

Possible solution would be to list multiple targets on a task, and if one is a match, then the task is ran.

Additional context

Thanks for your time and consideration!