'ckeditor' is not a known element Ionic 4

Hi, i am working on an Ionic project. I am trying to integrate the CKEditor module: https://ckeditor.com on my project.

<ckeditor [(ngModel)]=“content” editor=“Editor”>

I am getting though an error: ‘ckeditor’ is not a known element.
So, i tried some solutions ,which i have found on the internet,but unfortunately nothing worked for me.
I tried including the CUSTOM_ELEMENTS_SCHEMA and NO_ERRORS_SCHEMA . I included the FormsModule,but no chance.
I was wondering, if you could help me ,please?
Thank you in advance.

Hi, so i solved the problem. I did the following:

var textarea = document.getElementById('editor1');
const ClassicEditor = require( '@ckeditor/ckeditor5-build-classic' );
ClassicEditor.create( document.getElementById( 'editor1' ) )
.then( editor => {
    console.log( editor );
} )
.catch( error => {
    console.error( error );
} );