How to get token with recaptcha enterprise Angular 8+

Question

I'm trying to implement recaptcha enterprise in angular 12, but documentation is not being clear, I implemented it in the class according to the documentation link, but the method does not return the token in $event

<form [formGroup]="partnerForm" (ngSubmit)="becomePartner($event)" #partnerFormEl="ngForm" method="POST"> 

<button id="demo-form" class="g-recaptcha"
            data-sitekey="6LeCCoYfAAA..."
            data-callback='becomePartner'
            data-action='submit'>Submit</button>
</form>

I need a light on this documentation, any example already implemented?