Reads and persists the configuration for the current Insights widget instance.
The returned config is the widget definition's defaultConfig merged with any
per-instance overrides. The returned setter merges a partial update into the config and
hands it to the Insights page, which decides where it is written: outside edit mode it
is persisted immediately (independent of the "Save Layout" action) so config changes
such as a selected chart data type survive a page reload; while the layout is being
edited it is held in draft state and committed together with the layout on "Save Layout".
Must be used within an Insights page widget rendered by the dashboard.
Example