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When you work with a form in Angular then try accessing and working with data from form directives: FormGroup, FormArray etc.

In your code you've combined output of data from simple contacts array and tried then mix it with form controls.

Create form group for all the form correctly so that it matches your interface, then use data from it on the form, especially if you have an ability to modify it in form.

Using formControls on inputs etc your data is being modified on user input so you can retrieve it with a .value property. When you group data in formGroups you can access all then aggregated data with formGroup.value where all the structure and data you created will be.

I've updated your stackblitz. With partially implemented what I've told. Continue in this way and you'll get maintainable and quite readable code.

https://stackblitz.com/edit/angular-movie-read-load-json-sample-eg-l6awjk?file=src/app/app.component.html

Update

Address edit example in stackblitz: https://stackblitz.com/edit/angular-movie-read-load-json-sample-eg-w9ty9b?file=src/app/app.component.html

Something is definitely wrong with that input string: \xE3\xADs

The first nibble E indicates that it should be a 3-byte UTF-8 sequence, but there are only two bytes.

And it's definitely not the í as thats the two-byte sequence \xC3\xAD.

I have to wonder why you've got that clean_unicode_literals function in there at all as all JSON strings and documents are supposed to be valid UTF-8 according to the JSON spec.

Try removing the clean_unicode_literals calls, and if you're still getting an error then the source data is corrupt.

First of all, duplicate content is something different ("content that appears on more than one web page").

In your case, you have one Organization item that gets referenced as publisher of three NewsArticle items. This is the perfect solution for such a case.

The output in the SDTT shows you that Google understands it correctly. It lists the three NewsArticle items, and each NewsArticle has the Organization as publisher. In some cases, each news item might have a different organization as publisher, but in your case, it’s the same organization. That is, of course, not problematic: it is the same organization, so this should be represented in the structured data, too.