Flac support on ipads

Hi,
I believe that you can add flac support to iPad or mobile applications. Therefore, we can listen flac quality music by using portable DAC such as fiio k1. Now, I can listen on my computer with fiio k1 and sony mdr a1bt. Also fiio k1 or other portable DACs can used with iPad pro 11” and iPhone x with otg cable.
Best,
Emir.