I miss the ability to generate a Digital Signature or a printable/PDF Digital Certificate with Digest (SHA256) digital hash verification, and encrypted electronic timestamp with eIDAS qualified service (QTSP) for documents added.

This helps with:

-- Legal proof that the document has not been changed after the time stamp
-- Time stamps from qualified trusted service providers, e.g. D-TRUST
-- Very high evidential value according to EU regulation eIDAS-VO
-- Internationally standardized (RFC 3161)
-- Easy use of time stamps with digiSeal software and integration into processes

Or it can be available as a plugin feature.

Sample dummy certificate attached. It doesn't have to look exactly like that, but you get the idea.