Unfortunately, mods that rely on the popular script extenders (SKSE, F4SE, etc) will not currently work with Game Pass. But these days, New Vegas definitely looks dated. The game looked considerably better than Fallout 3, especially with the new game engine (at the time).
“As a result, F4NV cannot work on consoles, even if the above restrictions were loosened or removed. Fallout: New Vegas may not have been among the best looking games released in 2010, but it was far from being the worst.
Clean HUD mod by erfet, installation of them both is the same as well. “Unfortunately, restrictions placed upon the kind of mods that can be uploaded for console users include one the makes it impossible for F4SE to be released on consoles as well,” the devs continued. As TTW is a Total Conversion for Fallout: New Vegas, many mods that work for FNV. Fallout 4 and Skyrim have their own mod options from Bethesda and these are the only options you have.
There is no way to install any of the mods on that website on an Xbox One.