Shell Flyout Tab Bar Font Family and Content Page Font Family

[sisaacks]

I have a Shell Flyout with tabs and each tab has an icon and title. However I am unsure how to change the font family for the bottom tab bar title? I can change the font family on the flyout...but the actual tab bar at the bottom I cannot find a way to change the font there. I read online that its not possible...but I read in another area that it was....but I never found a solution that worked.

I also have not found a way to change the font family for the title on a content page.