Select items in multiselect on Product form in adminhtml

On the Product edit form in adminhtml, I have added a multiselect field by overwriting the modifyMeta() method on MagentoCatalogUiDataProviderProductFormModifierAbstractModifier as so:

<?php
namespace DotancohenFoobarUiDataProviderProductFormModifier;

use MagentoCatalogUiDataProviderProductFormModifierAbstractModifier;
use MagentoUiComponentFormElementInput;
use MagentoUiComponentFormElementSelect;
use MagentoUiComponentFormFieldset;
use MagentoUiComponentFormElementDataTypeText;
use MagentoUiComponentFormField;
use MagentoUiComponentFormElementMultiSelect;

class Features extends AbstractModifier {

    public function modifyMeta(array $meta)
    {
        $meta_extend = [
            'dc-product-foobar' => [
                'arguments' => [
                    'data' => [
                        'config' => [
                            'label' => __('Foobar'),
                            'collapsible' => true,
                            'componentType' => Fieldset::NAME,
                            'dataScope' => 'data.dc-product-foobar',
                            'sortOrder' => 10,
                        ],
                    ],
                ],
                'children' => [
                    'testmultiselect' => [
                        'arguments' => [
                            'data' => [
                                'config' => [
                                    'label'         => __('Multiselect Element'),
                                    'componentType' => Field::NAME,
                                    'formElement'   => MultiSelect::NAME,
                                    'dataScope'     => 'testmultiselect',
                                    'dataType'      => Text::NAME,
                                    'sortOrder'     => 10,
                                    'options'       => [
                                        ['value' => '0', 'label' => __('One')],
                                        ['value' => '1', 'label' => __('Two')],
                                        ['value' => '2', 'label' => __('Three')],
                                        ['value' => '3', 'label' => __('Four')],
                                    ],
                                ],
                            ],
                        ],
                    ],
                ],
            ],
        ];

        $meta = array_replace_recursive($meta, $meta_extend);
        return $meta;
    }

}

This code does properly add the Multiselect field. How can I now set specific values as being selected? The data is coming from an outside process, not the database, so I need to set the values here in PHP.

I’ve tried the obvious adding of elements 'selected' => 'selected' and 'selected' => true to the relevant values’ arrays, like so:

'options'       => [
    ['value' => '0', 'label' => __('One'), 'selected' => 'selected'],
    ['value' => '1', 'label' => __('Two'), 'selected' => true],
    ['value' => '2', 'label' => __('Three')],
    ['value' => '3', 'label' => __('Four')],
],

Neither approach worked. Then I tried to add some JavaScript that might select the elements, as suggested here:

// Javascript on the fieldset itself
'config' => [
    'after_element_html' => '<script>require([], function(){console.log("Hello, fieldset!");});</script>',
    'label' => __('Features'),
    'collapsible' => true,
    'componentType' => Fieldset::NAME,
    'dataScope' => 'data.dc-product-foobar',
    'sortOrder' => 10,
],

// Javascript on the Multiselect element
'config' => [
    'after_element_html' => '<script>require([], function(){console.log("Hello, Multiselect!");});</script>',
    'label'         => __('Multiselect Element'),
    'componentType' => Field::NAME,
    'formElement'   => MultiSelect::NAME,
    'dataScope'     => 'testmultiselect',
    'dataType'      => Text::NAME,
    'sortOrder'     => 10,
    'options'       => [
        ['value' => '0', 'label' => __('One')],
        ['value' => '1', 'label' => __('Two')],
        ['value' => '2', 'label' => __('Three')],
        ['value' => '3', 'label' => __('Four')],
    ],
],

However the JavaScript is not being invoked. I do see that that the two after_element_html values are appearing in some escaped JSON string in the HTML, but the <script> tag itself is not in the DOM.

How can I either assert that specific options’ values are to be selected in the PHP array, or how can I get that JavaScript invoked so that I could select them using JavaScript?