Question: How do I cluster specific markers

[SergueySHD]

I know it's not the place to ask questions, but...

Is there a way to cluster specific markers together? Let's say I've got 3 markers, 2 of them have a property that has the same value whilst the third one doesn't. I want to cluster those 2 markers, but not the third one. But if I would introduce a fourth one that shares a value with the third marker, I would want to cluster those 2 together.
Is this something that can be done using the reduce function? All markers come from a different source (but are in the same feature array when passed to supercluster)

Thanks in advance!