Dataview plugin snippet showcase

Thanks. It is looks like just what I need, but the documentation on it is so short and confusing. How I can edit yaml values from dataview tables? and what are those “::” . how i can use these predefined values I set in the plugin’s setting?

p.s. I get how predefined value works now. but how i am going to set it for nested values? for example I am going to set some predefined values for project.info.status? not just simple status?