[keycloak-user] Documentation for what properties are available on template pages (login.ftl, etc)?

I have looked over the keycloak documentation, but I can't find out what properties are available when customizing the various keycloak template pages. For modifying login.ftl, I have resorted to inspecting the source code of FreeMarkerLoginFormsProvider.java to find out what attributes are added to the attributes hash map. Is there any documentation for this? Thanks, Jordan Keith