If you want to display full gamut to just everyone on VK, I suggest you give up. But if you want to offer a full gamut file to those who have color managed systems and know how to use them, then linking to a TIFF file could work. Unfortunately, TIFF files are big, even with (lossless) compression. A more dangerous idea is to export the files [Edit: I mean as jpg] with Adobe RGB profile embedded, with the warning that those who don't know how to view them in a color managed system will see bad desaturated colors. From what I read, PNG files use embedded profiles properly, but I don't know if common web browsers pay any attention. PNG files will be smaller than TIFF but not as small as jpg, which uses a lossy compression algorithm.
I think it would be a worthwhile experiment to post jpg, TIFF and PNG, all three with wide gamut embedded profiles, plus a normal jpg sRGB, to VideoKarma (don't know if the site will allow all types) and see what the results are with different browsers.
The only guaranteed way to get wide color gamut to a viewer is to send a file to someone who knows what they're doing; others may be tripped up by defaults and limitations of their software and hardware.
This page explains (to some extent) the messy situation with web browsers.
https://www.benq.com/en-us/knowledge...0color%20space.
Note that some default to sRGB, some do not, some adjust to the monitor profile, some do not. This is why settling on sRGB is the way to ensure everyone sees the same thing, although that thing then cannot include wide gamut colors.