I want to input GameObject(has camera component) to Canvas's EventCamera by using Scripts

In my game,

Players Camera is created dynamically in scene.

before start it doesn't exist in scene.

and also I can't access that camera script cause this is not a script just dll file

i want use this camera at Canvas's button's Event camera

What should I do?

this is my canvas's Inspector

and this is my whole scripts

export default class GetCamera extends ZepetoScriptBehaviour {

 //private PlayerCam: UnityEngine.GameObject;
 public canv: UnityEngine.Canvas;

 private PlayerCam: UnityEngine.Camera;
 private gmaObj: UnityEngine.GameObject; //ZepetoPlayers
 private ZepetoCam1: UnityEngine.GameObject; //ZepetoCamera
 private ZepetoCam2: UnityEngine.GameObject; //CameraParents

 //Start() {
 //    this.StartCoroutine(this.getCameraFunc());
 //}


 OnTriggerEnter(collider) {
     if (collider.tag == "Player") {
         console.log("Success!!");
         this.StartCoroutine(this.getCameraFunc());
     }
     
 }

 *getCameraFunc() {
     yield new UnityEngine.WaitForSeconds(1);
     //this.PlayerCam = new UnityEngine.Camera;

     //this.gmaObj = UnityEngine.GameObject.Find("ZepetoPlayers"); //ZepetoPlayers
     //console.log("gmaObj name = " + this.gmaObj.name);

     //this.gmaObj

     //this.ZepetoCam1 = this.gmaObj.transform.GetChild(2).gameObject; //ZepetoCamera
     //console.log("ZepetoCam1 name = " + this.ZepetoCam1.name);

     //this.ZepetoCam2 = this.ZepetoCam1.transform.GetChild(0).gameObject; //CameraParents
     //console.log("ZepetoCam2 name = " + this.ZepetoCam2.name);

     //this.PlayerCam = this.ZepetoCam2.transform.GetChild(0).GetComponent<UnityEngine.Camera>();//ZepetoCamera

     this.PlayerCam = UnityEngine.GameObject.Find('CameraParent').GetComponentInChildren<UnityEngine.Camera>();

     //this.canv.worldCamera = this.PlayerCam.GetComponent<UnityEngine.Camera>();
     //console.log("PlayerCam name = " + this.PlayerCam.name);
     //console.log(this.PlayerCam.name);
     //this.PlayerCam.GetComponent<UnityEngine.Camera>();
     //console.log(this.name);

     //this.canv.worldCamera = this.PlayerCam.GetComponent<UnityEngine.Camera>();
     this.canv.worldCamera = this.PlayerCam;
     //this.canv.worldCamera = UnityEngine.GameObject.Find('CameraParent').GetComponentInChildren<UnityEngine.Camera>();

     console.log("Camera worked!!");

 }

}

there are lots of legacy codes sorry..

I tried my best

I used typescripts