How to display charts for a specific entered date: Using ion-datetime to get the dates?

I am new to development and I have been working on this thing. I am using ion-datetime to get some input dates. After, I would like my data charts to be displayed after hitting a button "search" according to the dates I entered (knowing I have a backend implemented which contains the data to be displayed on the (here is an image of how the ion-datetime is displayed1) chart. Should I create an endpoint or something? Please somebody help me.

here is the html code

<ion-col size="6">
        <ion-item lines="full">
          <ion-label>From</ion-label>
          <ion-datetime  [max]="'2100-12-31'" display-format="DD/MM/YYYY"  [(ngModel)]="dateValue1"></ion-datetime>
        </ion-item>
      </ion-col>
      <ion-col size="6">
        <ion-item lines="full">
          <ion-label>To</ion-label>
          <ion-datetime [max]="'2100-12-31'" display-format="DD/MM/YYYY"  [(ngModel)]="dateValue2" ></ion-datetime>
        </ion-item>
      </ion-col>
    </ion-row>
    <ion-button (click)="search()"> <ion-icon slot="start" name="search"></ion-icon>Search</ion-button>
    </ion-grid>