Freeipa additional hosts attribute, field

There is some hosts in freeipa list with some fields (Description, Class, Platform…)
How to add additional field?

I so manual about user attributes, but don’t understand how to do it to hosts.

HowTo/Add a new attribute - FreeIPA

As far as I understand, this is work with source files, but how to add attributes on running freeipa server?

The process of extending the LDAP schema is described here: