A standardized attribute on an HTML-form would be difficult to define, because in this context the page just requests/receives a binary file, so a generic "strip embedded location information" decision from the user would be hard to enforce and uphold (also, by whom?).
In this case Android only knows the file-structure and EXIF because the file is requested by Chrome from a Media Library in the OS, not a file-manager.
W3C keeps thinking about this data-minimization topic repeatedly [0], so far they managed to define the principles [1], but enforcing them technically is quite hard if any kind of content can be submitted from a storage to a webpage...
[0] https://www.w3.org/blog/2019/adding-another-permission/
[1] https://www.w3.org/TR/security-privacy-questionnaire/#data-m...