I just wanna snap support to discover… I know install snap apps on terminal but I think it’s possible a graphical support on discover.
First, we’ll check if Snap is installed and install it if it is not present already:
yay -S --needed snapd
Similarly, the below command will install Discover if you don’t already have it:
sudo pacman -S --needed discover
Then, open your Discover application, click on Settings on the left pane and then scroll down all the way to find Discover - Snap backend. Install it if it provides you the Install button.
That should do the job. Let me know if it worked 
If you don’t have Discover don’t install it. If you do Reborn has a tutorial on the forums for removing it. I’d suggest using Pamac-aur or Pamac-all over Discover, then install pamac-tray(then launch Autostart and add pamac-tray to it). Reborn devs say they have a version of Pamac-aur that has Snap support so you don’t need Pamac-all.