Yes, you can test figma templates with imagium by converting them to PDF's and then test as standalone PDF files as mentioned here

To convert a Figma template to PDF, you can follow these steps:

1. Open the template in Figma.
2. Click the "File" menu and select "Export".
3. In the "Export" dialog, choose "PDF" as the format.
4. Select the pages or artboards you want to export.
5. Click the "Export" button to download the PDF file.

Alternatively, you can use the "Print" feature to convert the template to PDF. To do this, follow these steps:

1. Open the template in Figma.
2. Click the "File" menu and select "Print".
3. In the "Print" dialog, choose "Save as PDF" as the printer.
4. Click the "Print" button to download the PDF file.