Is there a way to contribute an example to the STM32CubeIDE?

[Tesla DeLorean]

For user curated content I'd suggest maintaining your examples on GitHub, and gauge the level of interest in them from there.

[Piranha]

ST doesn't even accept a trivial code fixes for critical issues, because it's not verified and tested by their super "competent" team. They don't even update old broken versions of popular libraries from trusted sources for years because of that!