Are the Carabao Cup 2023 semifinals two legs? How the League Cup finalists are determined

Manchester United and Newcastle are already in the Carabao Cup semifinal. But will they have to play one or two more games to reach Wembley.

source https://www.sportingnews.com/us/soccer/news/carabao-cup-2023-semifinals-two-legs-league-cup-finalists/dqbghvuh9tgwtat40ilmfdt2