Change picture-in-picture forward/backward values in AVPictureInPictureController

How can be changed playback (forward and backward) buttons values in AVPictureInPictureController?

My backward and forward buttons have 15 seconds value by default (screenshot from my app is attached), but I've found other apps has 10 seconds (for instance, Apple TV iOS app).

This Apple forum discussion I've read that AVPlayerViewController adapts its capabilities and controls to the asset being played.

But it seems backward/forward values in PiP stay the same for all videos independent of duration in both my app and apps I've found.

But I can't find the way to change them.