Optionalshapeangular (the default dial) or bullet (a horizontal bar).
OptionalaxisThe dial's ends, on axis.range.
OptionalstepsThe coloured arcs behind the bar. Plotly resolves range and color for
every step; name only when the author wrote one.
OptionalthresholdThe target line. Plotly resolves value to the boolean false when the
author set none, which is why it is not simply coerced to a number.
The dial an indicator trace draws, as plotly resolves it.
Only present when the trace's
modeincludesgauge; anumber-only indicator is a text tile with no dial and no container here.