According to Help:
"If a song has lyrics (or other text) in the Lyric Memo or Lyric Document, these lyrics will show up on the Big Lyrics window, so that they can be seen during playback. If you have lyrics in text format, it is easy to paste them in as a Lead Sheet Memo and see them on the Big Lyrics window as well."

So you should be able to paste/enter them in the Lead Sheet memo.

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