globalContextTracks property
Context tracks to add globally, an array of either instrument tracks, speech tracks, or a mix.
Context tracks are not tied to data points, but play at a set interval - either based on time or on prop values.
API Docs: https://api.highcharts.com/highcharts/sonification.globalContextTracks
Implementation
List<HighchartsSonificationGlobalContextTracksOptions>? globalContextTracks;