Riverdale was shown by Channel 5 on their 5* channel here in the UK, but failed to get an audience.
The first season aired in a primetime slot but by the end was being aired at 1am. (Pretty common for C5 to move low rating shows - Suits was bought by their Paramount Network channel because of who was playing Rachel Zane, but when that failed to attract audiences even with her in it, it moved from 9pm to almost midnight, with a Kaitlyn Olson sitcom, The Mick, and Will and Grace repeats taking priority).
The 2nd season had 5* stripping it daily at 5pm with the Neighbours repeat airing after it. It was as if C5 were trying to capitalise on KJ Apa being Australasian and being in a soap once upon a time.
Unfortunately it meant Riverdale, at 5pm, was against Neighbours - +1 transmissions saw it against The Simpsons, Home and Away and Hollyoaks. I believe it got little audience.
C5 haven't picked up further seasons since.