How to use an alias name for Angular expression?

I am using Angular 7

I have following template

<div>
{{myService.userInfo.firstName}} {{myService.userInfo.lastName}}
</div>


I want to make it short by substituting user instead of myService.userInfo

<div>
{{user.firstName}} {{user.lastName}}
</div>


How can I do this like ng-init in AngularJS.

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