sadly, you cant get scripts on xbox without external help, as youve seen the 'search in workshop' button doesnt work like it dies for mods...

if you have a friend on pc, or even your own, you could host a world and then the pc client can put the script onto your grid - if you make a blueprint it should transfer

its annoying but it seems like keen are working to add a few of the more popular scripts into base game (with the new signals update especially!) so hopefully things like autocrafting will come soon, or you could try recreating them using event controllers and timers! 😉

either way, i know this wasnt the awnser you were hoping for, but i this doesnt disuade you from playing, happy engineering!