The suicide note is a last message to those you leave behind. As I see it, the best thing is to write everything you think you should and want to express. If you feel like you should say something to a person, then do it.
Also, if you write a note for someone very special to you, try to be as explicit as possible, as this will help these people not find it so difficult to go through a mourning related to guilt, after the death of a suicide, those close to them may experience the "I could have done more for this person..." If you want to spare them a lot of pain, it's best to leave no room for them to take the blame for what happened to you. Of course, this in the event that they have nothing to do with your decision and you do not want to cause them any harm, a note to those who hurt you is something like a last "fuck you!".
Those are the conclusions I came to when thinking about my own notes and reviewing other suicide cases, leave with no regrets and be at peace with your decision.
If you are sure of your decision, I hope you can express your feelings and rest easy, I wish you only the best.