Harmony

[RepresentingCaution]

This is a question for the music nerds out there. I'd like to learn harmony for new songs. One thing I really miss about being in a church choir is learning to sing the harmony for songs such as this:

However, it's hard to do that on the internet since the few videos that include harmony almost never present it separate from the melody. Does anyone know of good videos or channels for learning a new harmony? Looking at the music helps me somewhat, but I'm not good at sight reading, so I really need to hear a harmony to learn it.