Using JSON Resource outside of an API...

I have a JSON Resource, written about 4 years ago, that returns an array exactly as I want it. It includes some pivot table values. Here's a trimmed/example version:

class ProductResource extends JsonResource
{
    public function toArray($request)
    {
        return [
            'id' => $this->id,
            'name' => $this->name,
            'pivotval1' => $this->whenPivotLoaded('member_product', function () {
                return $this->pivot->pivotval1;
            }),
            'pivotval2' => $this->whenPivotLoaded('member_product', function () {
                return $this->pivot->pivotval2;
            })
        ];
    }
}

When I query a ‘Product’ via the API I get this JSON:

{
    "id": 2,
    "name": "Artificial Grass",
    "pivotval1": "Pivot Value 1",
    "pivotval2": 5000
}

How would I access this from a Trait or Job or somewhere other than the API Controller? Got a real blank on this 🤯

If I do something like this:

$product = Member::find(1234)->products(2)->first();
$resourceresult = new ProductResource($product);

I get this which includes all the pivot stuff nested:

{
    "id": 2,
    "name": "Artificial Grass",
    "pivot": {
        "other_pivot_stuff": true, //etc etc
        "pivotval1": "Pivot Value 1",
        "pivotval2": 5000
    }
}

Is there a way I can get it to return exactly as it does from an API call?