AG Grid Row Grouping in SSRM : SetFilter does not work #Angular

I have a ag grid with Server-Side Row Model with group rows and rows inside the group are loaded dynamically. I have set up a **agSetColumn ** filter on one column. But when the group row is loaded, the filter does not work when applied.

Problem

Set filter LangList is like ['en','es','de']

ag grid

and on thing in .ts this.gridApi.setServerSideDatasource(this.translationDataSourceService); and translationDataSourceService implements getRows as expected

Followed the Ag grid documentation but it says filtering happens on Server side. I guess I am going in wrong direction. my data is already there. just wanted to work

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