I'm looking to be able to use the label from the current selection on the Category Selector to be shown within the chart as the label for the data. Within the Category axis label, there's only the option to use your own text.
Not exactly what you are looking for but something like this might give you an alternative to "title" the chart dynamically by the selector. https://community.esri.com/t5/arcgis-dashboards-blog/dashboards-that-pop-dynamic-element-titles/ba-p...