Actually, you can do it by yourselfCan you share please?
loot for those lines
<item name="mode_rear_supported">
mode_normal,
mode_panorama,
mode_dual_camera
and add mode_slow_motion (don't forget the , after dual_camera) like this ->
<item name="mode_rear_supported">
mode_normal,
mode_panorama,
mode_dual_camera,
mode_slow_motion
and VOILA!!
lemme know if it worked for you too, it did for me
