When you add an action, you can give it a special Title. By default, the Title is blank. However, you can customize it to whatever you like.
Title Font Settings
To adjust your custom title, select the text icon near the end of the title field. This will bring up the font settings, allowing you to customize the appearance of your title to your liking.
The title will appear on the icon, and you can choose whether it will be overlaid on the top, middle, or bottom.
Link Action State Titles