Starting the app version 3.0, planning by sprint is available thanks to Agile scheduling.
Unlike in Standard scheduling, you would have to select the project board(s) instead of project(s) in chart configuration.
The task start/end fields are not configured as the task start/end dates are defined by a sprint a task belongs to.
If needed, the task on a chart can filtered by sprint.
On Gantt chart with Agile scheduling, the sprint markers are shown.
If needed, the sprint marker display can be removed from a chart view via User settings.