function my_acf_format_value($value, $post_id, $field) {
    // Check if it's the specific field you want to modify
    if ($field['name'] == 'your_field_name') {
        // Disable HTML filtering
        return $value;
    }

    // If it's not the specific field, return the original value
    return $value;
}

add_filter('acf/format_value', 'my_acf_format_value', 10, 3);