Musescore 3.6 and 4.0 plugin to apply lyrics in lilypond format.
It can be used also as a general lyrics text editor.
The lyrics in the score are linked with the text editor but only in one direction: if you click a lyric syllable in the score, the corresponding syllable is automatically highlighted in the text area. This feature uses a function available in MuseScore 3.6 onwards.
MuseScore 4.1 will have an adjusted version built in (see here. This version could get used in 4.0 too.