Open an help from Excel add-in

I have created few add-in for Excel in Visual Studio 2019. Also, I distribute them across the company. Now, the company asks me to create an help for each add-in. I use GhostDoc to create helps. The output is a bunch of help files as you see in the following image.

What I want to do is to add a new icon in the ribbon in the add-in to allow the user to open the help. How can I implement that?