Currently RLS only works on report server or database side, you can't enable RLS on paginated report
What we can do here is we can embed the paginated report and when you embed a paginated report, you can control which data is displayed. This allows tailoring the displayed information per user. For example, if you have a Power BI paginated report that includes global sale results, you can embed it so that only the sale results from a certain region are available.
This feature provides a secure way of displaying a subset of the data, in a way that doesn't compromise the rest of data. It resembles the Row Level Security feature, which provides a secure way of displaying data in Power BI reports (that are not paginated), dashboards, tiles, and datasets.
When applying row-level security to a Power BI paginated report, you need to assign a Perameter to the UserID attribute. This parameter will restrict the data pulled from the dataset, before the report is embedded.
Here is the reference doc to Use row-level security with Power BI embedded analytics content - Power BI