Any way to make the SD Card the default write disk for downloaded apps on this particular phone?

I have a Unrooted Oppo Mirror 5 (A51W) and it looks like there aren't any options in the Settings Menu to change the default write disk from the internal memory to the SD Card for downloaded apps. Is there a way to do this without rooting/installing 3rd party applications on the phone? Got traumatized as I fiddled with it and got stuck in a boot loop before... :I

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