How to install Nvidia beta driver on rpm-ostree?

I want to try the beta nvidia driver on my Kinoite 37 install.
This guide calls for using a command not available with rpm-ostree (as far as I can tell).
So, how do I specify that the rpmfusion nonfree rawhide repo is the preferred source for the nvidia packages?
Do I need to manually edit /etc/yum.repos.d/ files, like stated here, or is there an easier way?

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