InjectionToken<CngxChartLayer>
Injection token each layer atom provides via { provide: CNGX_CHART_LAYER, useExisting: CngxX }. A contentChildren(CNGX_CHART_LAYER, { descendants: true }) query on the chart shell collects every mounted layer's geometry through DI.
{ provide: CNGX_CHART_LAYER, useExisting: CngxX }
contentChildren(CNGX_CHART_LAYER, { descendants: true })