Embedding Power BI report into SharePoint, share for external users and apply RLS

Hey everyone,
I'm having this interesting problem. I hope you know a little bit more to help me with it.

Scenario:
We want to publish a couple of reports inside a SharePoint page for our customers. But of course, they should see just their own information, so we must apply the necessary RLS rules to achieve this.
I didn't have any problems with the external users. They can see the entire reports with the information for all the customers, inside PBI Services and the SharePoint page as well.

Problem:
The problem is when I try to apply an RLS rule for these external users. The RLS rules work when the user has a "Viewer"  role ("role" in the workspace). But if I do that, the external user can access the report but not the data (They will see just titles without any visualization).
If a try to give the external user a "Contributor" role, can see data inside the report but the RLS doesn't work.

Question:
- Is there a way to apply RLS for external users?
- Can I share a report for my customers without duplicate my reports once per each customer?

Thanks!