Add a "keyboard" for NVidia Shield

I have an NVidia Shield managed by a Harmony Hub. I also have all my keyboards setup in HA for the keys that Harmony has. One item I am missing is a keyboard. When I’m in YouTube or whatever and want to type my search criteria I have to scroll around all day. Most of you know this process. Is there a way to add a virtual keyboard to I guess Harmony Hub so it can send number and letter commands to the Shield? I have no problem creating the keyboard in HA once I have access to the commands, just not sure how to get Harmony to add the commands to the Shield since it’s not part of it’s own remote.