fields property
The fields that should be updated.
At least one field must be specified. The root videoProperties is
implied and should not be specified. A single "*" can be used as
short-hand for listing every field. For example to update the video
outline color, set fields to "outline.outlineFill.solidFill.color". To
reset a property to its default value, include its field name in the field
mask but leave the field itself unset.
Implementation
core.String? fields;