'Azure Data Factory Incremental data refresh for CosmosDB using change feed when Dataflow->Source is chosen as query

I would like to write CosmosDB query as a source within dataflow where Dataflow->Source is set to CosmosDB and Source Option-Input set as Query. Change Feed option available with checkbox disabled and dynamic query available. Say for example query

Select empId, EMPName, joining date from employee 

and only modified data /new data to be pushed in target as feed. How to write dynamic content for change feed in this scenario? Change Feed Option

Expecting an example how to write dynamic content for change feed option for CosmosDB as source when source is chosen as **query **instead **collection **inside Dataflow.



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