How can I use Smart Hub Preview to show deep links to application content in the Smart Hub launcher?

Hello. How do I build content preview for my app when user focus on app icon .
Similar to youtube (in the attached image file)
Thank you!

The Preview Area feature is only available for contracted partners now. If you have questions about LG partnership, please contact your local LG office. If you don’t have the contact information, you can contact LG customer service center first. Thank you.

helpful to me too Thanks