Google has an Inactive Account Manager that allows you to specify people who will be given access to your account if you do not log in after a set amount of time. For instance, I have it set up so that if I don't log in after 3 months, then my family will be given read-only access to my account. Additionally, I can choose to delete my account outright.
Is there an equivalent feature for iCloud? I'm especially interested in iCloud backups. Can I set it so that if something were to happen to me, people of my choosing could gain access to it?