Automatically kick off other project pipeline

I have project A, B, and C.

C depends on A and B. But there will be D, E, F…etc. projects in the future which all will depends on A and B.

When making change to either A or B code, how can I automatically trigger pipeline for C, D, E, F, etc. without hard coding C, D, E, F triggers within A or B pipeline? I don’t want to trigger them from within either A or B. I want C, D, E, F listen if A or B pipeline runs and only then trigger of off it.

The Multi-project pipelines might be useful.