Thanks @Rafal_Bain yes, this should be a very common requirement But I do not know why they not implement it. Let me check the ideas and vote.
You're right I can use Fusion but that is not what I wanted.
Thanks @Jason_JB your solution is very helpful, you mean you set project as the Referenced Object Type, right?
we have lots of projects, so that means user may search some irrelevant contents, did you add any filters?