Pass data to NavPush via json file

Ionic Framework ionic-v3
1

Hello, as mentionned I want to pass data to NavPush via a json file.
This json file :

 "Categories": [
        {
            "name": "Bla Bla",
            "nombrePlace":  4,
            "Link": "../../assets/imgs/blabla.png",
            "function": "pushBlaBlaPage"
        },
]

this is my html code :

 <ion-item *ngFor="let item of items"  [navPush]="item.function">
     blabla
</ion-item>

in my ts file I did this :
pushBlaBlaPage: Page = BlablaPage;

I get this error :
Ungaught (in promise) invalidl Link : pushBlaBlaPage

Can someone help me please ?

Thanx