fields property
The fields that should be updated.
At least one field must be specified. The root style is implied and
should not be specified. A single "*" can be used as short-hand for
listing every field. For example, to update the paragraph alignment, set
fields to "alignment". 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;