Logging/notes for specific times on history graphs?

I am wondering if there might be a solution out there that would allow me to mark graphs with a notation, and in a dream world…would capture these data points and note in a meaningful table or note or?

I have a catchment cistern with a pressure sensor in it. This cistern is our main source of water for our home. I’d like a way log how much water each appliance is using on each cycle without having to put a flow meter in line (at this time).

If it needs to be a spreadsheet, I’ll go that route. If I can find something that will work and integrate with my HA install, that would be icing on the cake.