Building on the change in v5.4, which raised the note size limit from 10,000 to 50,000 characters, v5.6 will let you store secure notes of up to 50,000 characters independently of a password. These notes are not strongly typed like certificates and do not add additional capabilities, but they are suitable for storing certificates, SSH keys, and other textual content.
Support for these content types is on our roadmap, but we don’t have an immediate ETA. As this change request is quite broad, there are other threads that discuss specific aspects: SSH keys, FIles.