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I do not know what specific

I do not know what specific camera you're talking about.

Just inspected some GH5S file. For this file 0x004d/AFPointPosition tag is not in IFD0, but in makernotes section of EXIF.

The bad thing: this is NOT RAW/EXIF, but EXIF contained in embedded JPEG preview.

So, to extract the data you need:
- extract thumbnail (preview) using LibRaw::unpack_thumb
- use some EXIF parser to parse thumbnail's EXIF

-- Alex Tutubalin @LibRaw LLC