Add a range parameter to add-on field settings if the field type is "number"

pew_custom_checkbox_param.php

<?php

/**
 * Add a custom checkbox parameter to number field settings
 */

function pew_custom_checkbox_param( $group_key, $item_key, $item, $post_id ) {
    $field_type = isset( $item['field_type'] ) ? $item['field_type'] : '';
	
	
    if ( 'number' === $field_type ) {
        $enable_range_slider = isset( $item['enable_range_slider'] ) ? esc_html( $item['enable_range_slider'] ) : '';
		
        $checked = ! empty( $item['enable_range_slider'] );

        $input_attributes = array(
            'type'  => 'checkbox',
            'class' => 'pewc-field-range-slider',
            'name'  => sprintf( '_product_extra_groups_%s_%s[enable_range_slider]', esc_attr( $group_key ), esc_attr( $item_key ) ),
            'value' => 1,
        );
		
	error_log( print_r( $item, true ) );	


		$input_html = sprintf(
					'<input type="%s" class="%s" name="%s" value="%s" %s>',
					'checkbox',
					'pewc-field-range-slider',
					sprintf( '_product_extra_groups_%s_%s[enable_range_slider]', esc_attr( $group_key ), esc_attr( $item_key ) ),
					1,
					checked( $checked, 1, false )
				);

        printf(
            '<div class="pewc-fields-wrapper pewc-my-new-fields">
                <div class="product-extra-field-third">
                    %s
                    <label class="pewc-checkbox-field-label">Enable range slider</label>
                </div>
            </div>',
            $input_html
        );
    }
}

add_action( 'pewc_end_product_extra_field', 'pew_custom_checkbox_param', 10, 4 );

/**
 * Add the custom param to field data
 */

function prefix_item_params( $params, $field_id ) {
  $params[] = 'enable_range_slider';
  return $params;
}
add_filter( 'pewc_item_params', 'prefix_item_params', 10, 2 );