Can EOS R write HDR to a 'single' raw CR3?

[maddenmad]

Can any EOS R body create HDR to a 'single' raw CR3 file instead of to a single JPEG or HEIF??? APS-C or Full-frame. 

[p4pictures]

No this is not possible with any of the current EOS R series cameras. 

HDR images captured using different exposures for each frame can either be saved as a camera processed JPG or HEIF image or as individual RAW images. Some cameras can do both, some do not even have the HDR function. 

[Waddizzle]

This goes far beyond Canon cameras not being able to save the results as a RAW file.  It’s the fact that once you combine the RAW source files, the end result will no longer be a RAW file.  

For example, let’s suppose that you have three RAW files with different exposure settings; -2 Ev, 0 Ev, 2 Ev.  What exposure settings should be written to EXIF of a final RAW file?  What date and time?