How to open link in Youtube (sideloaded)?

I sideload uYou+ into iOS 14.

In order to share a Youtube URL from Safari to a tweaked Youtube app (like Cercube and uYou+), I get this shortcut, which led to the link to install.

2022-04-17, there is an enhanced method using a free app Userscripts. This app integrates an userscript to automatically prompt you to open the YouTube app when you open a YouTube link in Safari browser on iOS, instead of having to dig through the share menu like the previous method using this iOS Shortcut.