Looking to import and merge .cr3 from Canon-R

Is there a way I could import and merge .cr3 files from Canon-R?
I am looking to merge hundreds of thousands of bracketed exposures for a stop motion project.
I am looking for a command line option and this may very well be it. Is it a matter of updating to more recent version of libraw, or much more involved?
Thank you,

I don’t think HDR merge supports cr3 yet. Perhaps if you can build it yourself and include the master branch of libraw.

Indeed, this may be the way forward.

or you can use dnglab to make a dng out of the cr3, and merge those.

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