Field Value of Field on Referenced(parent) dataset

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I’m filtering results of a page from 3 fields on the same dataset but also looking to filter based on the value of a “parent” dataset. Is there defined syntax to look up an object to a dataset that is displayed in a repeater?
newFilter = newFilter . contains ( ‘title’ , keyword )
. or ( newFilter . contains ( ‘tags’ , keyword ))
. or ( newFilter . contains ( ‘type’ , keyword ))
. . or ( newFilter . contains ( ‘XXXXX’ , keyword ))
;
XXXXX needs to equal parent field value