WONDERFUL UPDATE! Per a comment from @adiraimaji below, I have updated the project file with a new preset so you no longer have to change the letter in each group. This will speed up your process even more!
Do you want to animate each character of your text individually with complete control but without the time consuming effort required? Look no further! This tutorial breaks down the process and we create presets to make your life so much easier. Let me know in the comments if you found this tutorial helpful, and if you'd like to see more like it.
Wonderful tutorial. In Addition, If you use expression *value+content(thisProperty.propertyGroup(2).propertyIndex).transform.anchorPoint;* instead of *value+content("A").transform.anchorPoint;* You don't need to worry about change the group name or modify expression after applying the preset.