Hi Murray
Hope you can use Sphericos app as it should help, but…
I might suggest another approach if that doesn't work out.
Most likely you are singing songs that the lyrics are readily available on the internet. Copy the entire song in any text editor, plain text preferred.
You can now do a copy/paste individual song lines into a lower thirds. Assuming you recorded video, you can watch the video and add markers where you want to divide the lyrics, add a new lower thirds title below and between each marked out segment and add the appropriate lyric lines to each title block. This approach allows you to control the timing of the appearance and end of each line(s). Takes time, but no need to type out the lyrics unless this is music not available online.
Again if Spherico's app works for you, it should save time.
Hope this Helps, Greg