Default [Q]Mount external sdcard as internal storage without root?

I have pretty large games like 2.4G and I have move the game data(obb files) to the external sdcard. Now the problem is I need to mount the sdcard as an internal storage so the game can recognize the game data. How do I do that without root? I just don't want root on this phone. Should I try copying the external sdcard folder to /mnt or something?

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