Report Builder (paginated report): Custom fonts not working in PDF exports from Service

Hello, I can't find the Paginated Report section in this forum..

I'm developing an .rdl report in Report Builder - Paginated report, (not SSRS) that uses the Montserrat font. The font displays correctly when I export the PDF on my local machine where the font is installed, and appears correctly in the exported PDF. However, when the report is generated and exported to PDF from the Power BI service, it gets replaced with a default font.

I've tried:
* Modifying the .rdl file directly to add the EmbeddedFonts section (Opening it as an XML file in VS Code)
* Looking for options in Report Properties
* Installing the font locally

Is there a way to embed the font directly in the .rdl report so it works when exported to PDF from the Fabric service?
Technical details:
* Using Power BI Report Builder
* Report is in .rdl format
* The font I want to embed is Montserrat
* Report needs to be automatically generated and exported to PDF by service online

Thanks for your help!