Tagging local synced lyrics to mp3/flac files

Hi,
I have several hundereds of music files with its lyrics in a separate txt file. Naming scheme is "title.mp3" for music and "title.txt" for lyric file. They all are synced files, i.e timestamps.
I want to embed all the lyrics to its music file. I have tried manually by selecting a file, extending a tag, adding the synced lyric from the text to the empty box with "UNSYNCEDLYRIC" format.

How can i do this automatically for all my music.

See the action "Import text file". In this action you can set a field and the filename which should be imported.
Please note that UNSYNCEDLYRICS is intended for lyrics without time stamp.
You would have to investigate the correct target field name