If it doesn't need to access root files, you install it inside a container.
toolbox create
toolbox enter
Takes just a few seconds and now you're inside a traditional Fedora 40 CLI system that can access your /home but otherwise has a separate file system. This is great for setting up a dev environment without polluting the host system.

If it does need to access root files, you can install it with rpm-ostree, which basically creates a new OS image that contains the app.
rpm-ostree install --apply-live [package name]
But if you feel like you need that a lot, a traditional Linux system would be a better fit.

The way I use Silverblue is kinda like Android. All the apps I need for my general purpose laptop are available as flatpaks. The OS itself kind of disappears in the background. I set it to update itself automatically without telling me and I actually don't do anything with the terminal or outside of /home . The OS is a GUI application launcher, which is exactly what I was looking for after 20 years of tinkering with Linux.