I am adding product attribute programmatically the following way:

use Magento\Framework\App\Bootstrap;
require '/www/public_html/app/bootstrap.php';
$params = $_SERVER;
$bootstrap = Bootstrap::create(BP, $params);
$obj = $bootstrap->getObjectManager();

$state = $obj->get('Magento\Framework\App\State');

$eavEavSetupFactory = $obj->create('\Magento\Eav\Setup\EavSetupFactory');
$eavConfig = $obj->create('\Magento\Eav\Model\Config');
$attributeSetFactory = $obj->create('Magento\Eav\Model\Entity\Attribute\SetFactory');

/** @var ProductSetup $productSetup */
$productSetup = $eavEavSetupFactory->create();

$productEntity = $productSetup->getEntityTypeId('catalog_product');
$attributeSetId = $productSetup->getDefaultAttributeSetId($productEntity);

/** @var $attributeSet AttributeSet */
$attributeSet = $attributeSetFactory->create();
$attributeGroupId = $attributeSet->getDefaultGroupId($attributeSetId);

        'type' => 'text',
        'backend' => '',
        'frontend' => '',
        'label' => 'test_attribute',
        'input' => 'swatch_text',
        'class' => '',
        'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Boolean',
        'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
        'visible' => true,
        'required' => false,
        'user_defined' => true,
        'default' => '',
        'searchable' => false,
        'filterable' => false,
        'comparable' => false,
        'visible_on_front' => true,
        'used_in_product_listing' => false,
        'unique' => false,
        'apply_to' => ''

Then I want to create a configurable product from the UI and I get a 500 error on the create page:

2020/01/26 04:06:54 [error] 1099#1099: *13639 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught TypeError: Argument 2 passed to Magento\Framework\View\Element\UiComponentFactory::argumentsResolver() must be of the type array, null given, called in /opt/magento/public_html/vendor/magento/framework/View/Element/UiComponentFactory.php on line 222 and defined in /opt/magento/public_html/vendor/magento/framework/View/Element/UiComponentFactory.php:174 Stack trace: 0 /opt/magento/public_html/vendor/magento/framework/View/Element/UiComponentFactory.php(222): Magento\Framework\View\Element\UiComponentFactory->argumentsResolver('custom_text_fie...', NULL) 1 /opt/magento/public_html/vendor/magento/module-ui/Component/Form/Field.php(85): Magento\Framework\View\Element\UiComponentFactory->create('custom_text_fie...', 'swatch_text', Array) 2 /opt/magento/public_html/vendor/magento/framework/View/Layout/Generator/UiComponent.php(164): Magento\Ui\Component\Form\Field->prepare()

What field am I missing that gets me this NULL value instead of array ?

PS: I am not using the declarative way suggested by Magento as I don't want to use patches to create new attributes as they are created dynamically based on user input. Therefore I am stuck in using the object manager (only way I have found to be still working in 2.3.3).

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