Partial RAW support - Extract "only" JPG previews from RAW

As RAW support from the Mylio side is not really coming forward (my feelings), but new formats/format variants appear multiple times per year, it would be wise to split RAW support to two versions:
V1) Extract only previews and thumbnails (usually JPG) and probably metadata -> this is more easier to implement, then process the RAW sensor data and also quicker to process
V2) Read the real RAW sensor data and process it.

I would also like this as a preference for the future.

If somebody is using an external RAW processor, it will use the real RAW data.
I don’t use Mylio for editing, only on rare occasions, as it cannot reach the quality level of my external processor. Maybe for simple crop/rotate on my phone for JPGs from the phone.