How to pass parameter to expression backed record


I have interface which filters data based on selected filter criteria. That filter criteria gets passed to REST API & API sends results back which displayed on GRID.

If I click on any 1 of record then summary page should be opened. But the problem is that when i pass unique field to Record type, I am expecting it should get passed to expression where i called REST API by passing unique field. Currently I am not able to pass unique key to expression backed record. How to do it?. Please note in expression i cannot get all records that's not possible i must have to pass filter criteria to REST API (Because REST API can't give all records.)

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