I have published a plugin that provides a fully customizable Gantt / Timeline Chart for your application. This Gantt / Timeline chart uses the data from your database or another dynamic data source. The plugin offers extensive customization options.
Demo page (the editor is public!): https://pluginpreview.bubbleapps.io/gantt
Plugin page: https://bubble.io/plugin/gantt--timeline-chart-1590674038645x890698412804014100
You can always reach out to me for questions, bug reports or feature request!