OptionaldisplayThe property whose value is the text a cell shows for a value of this kind, or null when
the kind shows none (an image).
OptionallabelThe name a UI shows for the kind, such as in a list of what can be inserted. The name when the kind has no label of its own.
OptionalmetaThe kind's own presentation (a card, an icon, a provider), or null for none.
The kind's name: what a value's JSON names as its type.
OptionalpropertiesThe kind's properties, in the order the kind declares them.
A kind saved with the workbook whose values name it: one that is not registered in code, such as a kind read from a file.