The timeline is one of those widgets which will try to get its dimensions from the encompassing box, so it’s tricky to include in a template…
You might be able to make it work using the same hack as the knob widget:
For the model to pass, use the trick in HABPanel Development & Advanced Features: Start Here! - #11
Instead of documenting every possible model option for every widget, here’s a trick: add your widget to a dashboard the standard way with the designer, give it an unique name to find it back easily, adjust the options as you like, then go to HABPanel’s advanced settings and click on the “Edit the local panel configuration” link. You will then have to find your widget (using its unique name) and you’ll have the complete model to pass to ng-model this way. You can leave out the row, col, sizeX, sizeY, type attributes since they’re relating to the dashboards layouts themselves - type is the type identifier to put after widget- as the node name.