Thanks, I do have AP and I did notice the HEIF announcement... I found a website to convert;
https://convertio.co/dng-heif/
but it converted a 40Mb to a 300K image so don't have a lot of confidence in it.
With heif, jpg or dng - nothing is jumping out as a depth map channel or mask, and the only photoshop method I saw and tried was applying a lens blur and selecting 'depth map'.
Thanks for the offer - I have attached 2 jpegs showing the point of focus differences achieved within the phone app, and a dng. Oh, and a heif file.
It may be worth pointing out that the phone app can refocus the JPGs, but it doesn't give that option for the DNGs, and there's very little information that this is even possible. It'd be nice to confirm if the data is within the raw photo though, for future editing.
IMG_20191030_104312.dng
IMG_20191029_120154.heif