How do I set to open PDFs with Kami as default?

Hi all
I use Win10 and want to open PDFs with Kami as a default viewer.
Since Kami is not a standalone app, I know I can’t find it from the default Windows app, so I set it to open with Chrome as a default viewer. However, it still doesn’t seem to open with Kami, and I can’t find the tick option from the Kami settings either.
Please advise.