I understand that the 2019 Moderator Election is currently in the nomination phase, but the only information I found related to nominating relates to self-nomination.
How do we nominate other users as moderators?
People can only nominate themselves.
You cannot assume that someone else is willing to invest a lot of time for that.
And you really don't want to "spam" someone with a nomination who then has to opt out.
The worst case would be that someone is actually elected as a moderator without knowing about it. They might be on vacation or absent for another reason. Then we'd have a moderator who doesn't moderate – which is worse than having no one elected.