Lucio is a very similar hero in the way that his healing has a limited radius forming a circle of healing around the place that Lucio is standing. Lucio has many quality of life features to help him better understand when to effectively use his amp, such as a glowing ring and the number on screen showing how many people are actively receiving his AOE support.
My idea for Baptiste would be similar. I don’t think there would be need for the visible ring, since Bap’s ability is not passive, but I do think a number over the bottom of the ability’s icon could be a good way to let a Baptiste player know exactly how many people are receiving the effect. This would make it easier to ensure you are getting better value out of the ability without having to guess if someone is in range.
Just a thought. Would love feedback.