Similar case in Vermont - if a winning gubernatorial (maybe any state row office) candidate gets less than 50% of the vote, the election can go to the state legislature (maybe only the state senate?). However the 2nd place candidate waived his rights and allowed the 1st place candidate to win by default.
Again that’s not quite the same thing as winning a US House race and declining the victory.
It would appear the only comparable case listed (which they admit is not complete) is John Cantine. It appears that the seat was declared vacant and a new election was held.