So it likes a nice jelly but
I doubt it can cope with Vegemite.
Chinse scientists have found a previously unknown species of microbe on the nation’s Tiangong space station, and it may have evolved characteristics that help it to survive in space. As explained in a paper published in the International Journal of Systematic and Evolutionary Microbiology, astronauts aboard China’s Tiangong …
Yeahhh, about that...
"Scientists [..] have discovered 26 previously unknown bacterial species in the clean rooms that were used to prep NASA's Phoenix Mars lander for its August 2007 launch."
https://www.space.com/space-exploration/search-for-life/not-so-clean-rooms-scientists-discover-26-new-microbe-species-in-nasa-spacecraft-facility
Skin and stray hairs are mostly keratin.
Gelatin is degraded collagen as you say but that is derived from connective tissue (the gristly bits you spit out if you find them in pies), boiled down because it's otherwise inedible.
Gelatin is mostly found in wibbly wobbly, gummy food products. I reckon the cosmonauts have been living off trifle and gummy bears and not washing up.
Icon for the underneath of the blinkenlights panels...
Coronavirus: Bill Gates ‘microchip’ conspiracy theory and other vaccine claims fact-checked
"It claims that the coronavirus pandemic is a cover for a plan to implant trackable microchips and that the Microsoft co-founder Bill Gates is behind it."
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There are thought to be some billions of different microbe species. Of which a few thousand have been discovered, classified and named.
Rather than evolving in space, the laws of probability say its millions of times more likely to have just hitched a ride. I fully expect that if the chinese look hard enough, they find find many more. As would anyone who cares to inspect the ISS.