Solved
Chamfer dimesioning & tolerancing
As per the original post.
Is there any way to use the existing model annotation and add a tolerance to its angle? Surely it should be this easy: https://www.youtube.com/watch?v=8fzz2cMiAZc
Creo does not create that specific dimension type. You can create a note similar to it by placing the dimensions, setting the tolerance, and adding the dimensions to a leader note. Once in the note, you will need to go to the model to modify tolerances.
There is always more to learn.