I want to use a baseurl from parent which can be used for further process in child

Dashboard is Parent

  `<div class="layout-wrapper" [ngClass]="containerClass">
  <app-topbar></app-topbar>
   <div class="layout-main-container">
   <div class="layout-main">
     <router-outlet baseurl='MY_API_URL'></router-outlet>
    </div>
     <app-footer></app-footer>
   </div>
  <app-config></app-config>
  </div>`

I want a setup thus if in future i need to change the baseurl i can change it from the the tag only
for that the code for the respective child would be like
export class SpecimenComponent implements OnInit { @Input() baseurl = '';