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Hello @arunkumar.nehru,
I do not believe you can get this info via get_news_headlines via Eikon Data API.
If you are, however, looking for the news on specific RICs only, you can specify them in the request itself:
ek.get_news_headlines('R:LHAG.DE,T.N', date_from='2019-04-01T09:00:00', date_to='2019-4-05T18:00:00')
This type of info, as part of the complete metadata, is available with Machine Readable News from Elektron Data Feed, you may be interested to discuss this requirement in more detail with your Refinitiv account manager