What kind of animation play method is suitable for ios?

Hello everyone, what format should I use to play looping animations on Ios?

I currently use .mp4 videos to create cutscenes and victory and defeat animations. Since there is no transparency, I only use them in these places.
Then use .webp format animation to create the panoramic situational special effects animation required for the plot.
Finally, I used .png sprite sheet to make everything else needed.

However, there is currently no way to use the webp format on iOS.
Since what I need is animation that can cover the entire screen and have transparency, it is impossible to use png to create multi-frame animations, which will not maintain the smoothness of the game.

I wonder if there is an alternative to webp format on ios?

Thanks.