In the UK, we can file for accounts electronically. I believe it's by exporting the accounts in a format called "Inline eXtensible Reporting Language" (iXBRL).

https://en.wikipedia.org/wiki/XBRL

https://www.gov.uk/company-filing-software

The following is a list of software tested by Companies House that they recommend to companies for electronic filing. When or if GnuCash adds this support, it could also be added to this list.

https://www.gov.uk/company-filing-software/filing-annual-accounts-returns-and-tax-accounts

It appears this format is also accepted in the US, and Singapore as well.