test.php

<?php

add_filter(
	'blocksy:archive:render-card-layers',
	function ($layers, $prefix, $featured_image_args) {
		$post_id = get_the_ID();

		if (
			get_post_type($post_id) !== 'blogger-template'
			||
			has_post_thumbnail($post_id)
		) {
			return $layers;
		}

		$bt_image_url = rwmb_get_value('bt_image_url', $post_id);
		$alt_text = 'Check Out ' . rwmb_get_value('bt_name', $post->ID) . ' Premium Blogger Template';

		$featured_image_args['html_atts']['class'] = $featured_image_args['class'];
		unset($featured_image_args['class']);

		$featured_image_args['img_atts'] = [];
		$featured_image_args['img_atts']['alt'] = $alt_text;

		$layers['featured_image'] = blocksy_simple_image(
			$bt_image_url,
			$featured_image_args
		);

		return $layers;
	},
	10, 3
);