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Currently it is only possible to add the custom items into the scheduler header bar by defining those components within script section (i.e) using toolbarRendering request type within the actionBegin event as client-side script code. Therefore, not able to pass the angular component definition to add additional items into scheduler header bar.
https://stackblitz.com/edit/angular-ja3jup-vdipwq?file=default.html
Need to provide support to pass Angular component as custom template within the Scheduler toolbar.