If you want to target specific news post pages to specific audiences in a page library, please refer to:
1.Go to the pages library settings>select Audience targeting settings>enable it then click OK:
2.From the library, select a page, select the ellipses (...) and then select Details.
3.In the details pane, select a value for the Audience property. Republish to finish applying audience targeting.
More information for your reference:
If this is not feasible for you, please feel free to reply.
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