Besides such sources as Jira dates, Jira sprints, and Jira versions, the custom sources can be added to a calendar configuration.

The custom sources are default event types:

and all custom-defined event types.

The default event types can be easily selected when adding a source to a calendar configuration.

The custom-defined event types can be added by admin only, in the app configuration > Event Types.

Insert a name for a new event type, define the requirements and select one of the icons. Then, click Save button.

Once the custom-defined event type is created, it can be added to a calendar configuration.

If necessary, the admin can edit the configuration of the created event type.