Seems like I’m also now running to similar issues and limitations or maybe even a bug.
Trying to get the value of a MemberPicker and no matter what I try, I always just get the member key e.g.
umbValue: {umbValue:person} - person is the alias of the MemberPicker
I thought maybe {umbValue.person.firstName} or {umbValue.person.name} might work but it doesnt.
According to the docs {umbContentName:person} should work with Memberpickers
"Content Name
The Content Name component will render the name of a content item, (either Document, Media or Member), from the value of a given property alias. Multiple values will render the names as a comma-separated list.
The alias prefix is umbContentName. An example of the syntax is {umbContentName: pickerAlias}, which would render the component as <ufm-content-name alias="pickerAlias"></ufm-content-name>.
The Content Name component supports content-based pickers, such as the Document Picker, Content Picker (formerly known as Multinode Treepicker), and Member Picker. Support for the advanced Media Picker will be available in an upcoming Umbraco release."
But I don’t even get a value back when I do use {umbContentName:person}
Frustrating to say the least.