Officila document writes that:
You must have at least one bookmard in your report, when you publish it to the Power BI service, in order for bookmarks to be available in the service.
So, it is not possible for end users to add bookmarks depend on needs in any report published to service. If you have any concern about this feature, please submit your request at idea page.
Community Support Team _ Yuliana Gu
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