How to show waiting indicator while app is loading using APP_INITIALIZER?

How to show waiting indicator when angular app is executing app_initializer code.

As of now I can show waiting indicator till app is loaded. But after that page stays empty till app_initializer code is complete. So I want to show some sort of waiting indicator.

<app-root>Loading....</app-root>


Also Tried

<app-root></app-root>
<div>Loading...</div>


None of these option work when app_initializer is executing.... during this time period I am calling web api to get some startup data.

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