Extracted data layers belonging to this panel.
OptionaltitlePanel display name, read from the <VictoryChart title="..."> prop.
Emitted as the first layer's title, which MAIDR uses as the panel name
in subplot summaries.
OptionalsvgOrdinal of this chart's <svg> among ALL top-level Victory components
(each renders its own standalone <svg role="img">, including standalone
data components, legends, and unsupported components). Used to bind the
panel to the correct rendered svg even when non-chart Victory siblings
precede it. Absent in single-panel mode.
Intermediate representation of one subplot panel (one top-level
<VictoryChart>in multi-panel mode) before conversion to the MAIDR schema.