Getting properties of ember component from ember component-class

I have been trying to get the value of a propertie of a component from an action from its class. My main goal is to relate two objects: the "auction" passed into my component (shown in the code below)

new.hbs

<AuctionForm 
    @auction=
    @products=/>

with the selected product on a select tag inside the "AuctionForm" Component as so:

auction-form.hbs

<div class="row">
    <label for="product">Produto</label>
    <select name="product" onchange=>
        <option value="" selected='selected' disabled='disabled'>-------</option>
        
            <option value="" selected=></option>
        
    </select>
</div>

and I want to bind this two objects on the "selectProduct" action of the class:

auction-form.js

import Component from '@glimmer/component';
import { action } from '@ember/object';


export default class AuctionFormComponent extends Component {
    @action selectProduct(product) {
        this.get('auction').set('product', product); // this doesn't work on ember newest version
    }
    @action save(auction) {
        auction.save();
    }
}

Although, whenever I try to access its value on the component-class via "this.get()" function (just as I used to do on previous ember versions) I get an error saying that "this.get is not a function".

After digging a lot on the web I couldn't find a straight forward solution neither the official solution provided by the documentaion.

The closest I got to a solution was to declare "auction" as a computed propertie (https://api.emberjs.com/ember/3.22/classes/Component). But, I could not manage to implement it on a javascript file, once its structure (like the code below) only works on TypeScript files.

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { computed } from '@ember/object';


export default class AuctionFormComponent extends Component {
    auction: computed('auction', function() {
        return this.auction;
    }
    @action selectProduct(product) {
        debugger;
        this.get('auction').set('product', product);
    }
    @action save(auction) {
        auction.save();
    }
}

Does anyone knows the correct way of performing such a task in ember 3.22?

Thank you very much.