Use HTML in ionic4 Loading

Ionic Framework
1

With Ionic 3 I was able to do this:

const loader = this.loadingCtrl.create({
        message: this.sanitizer.bypassSecurityTrustHtml(loadingText) as string,
        spinner: 'dots'
});

or

loader.message = this.sanitizer.bypassSecurityTrustHtml(loadingText) as string,

And use there custom HTML inside Ionic Loading Component. With Ionic4 I just get an empty Loading. Is there a way to use HTML in the Loading Component with Ionic4 ?

Edit: when I append some text after the Safe HTML I get after the bypassSecurity i see this

SafeValue must use [property]=binding:

Edit 2: In the official docs says

and any optional HTML can be passed in the content property.

But there is no content property in HTMLIonLoadingElement