This example can be used to add text or HTML below each field in your form.

add_filter('frm_replace_shortcodes', 'frm_change_my_html', 10, 3);
function frm_change_my_html($html, $field, $args){
  if($args['form']['id'] == 10){ //change 10 the id of the form to change
    $html .= 'add additional content here ';
  }
  return $html;
}

Use this example to take the radio or checkbox input OUT of the label tags. Please note: Conditional logic that uses radio or checkbox fields will NOT work when you use this code. You must use custom JavaScript to make other fields show or hide when a specific checkbox or radio button is selected.

add_filter( 'frm_replace_shortcodes', 'frm_change_my_html', 10, 3 );
function frm_change_my_html( $html, $field, $args ) {
	if ( ! in_array ( $field['type'], array( 'radio', 'checkbox' ), true ) ) {
		return $html;
	}

	$dom = new DOMDocument();
	libxml_use_internal_errors( true );
	$dom->loadHTML( $html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD );
	libxml_clear_errors();

	$xpath = new DOMXPath( $dom );

	// Find all <label> elements that contain an <input>
	$labels = $xpath->query( '//label[input]' );

	foreach ( $labels as $label ) {
		// Find the <input> element inside the <label>
		$input = $label->getElementsByTagName('input')->item(0);

		if ($input) {
			// Clone the input element
			$inputClone = $input->cloneNode(true);

			// Remove the input from inside the label
			$label->removeChild($input);

			// Insert the input after the label
			if ($label->nextSibling) {
				$label->parentNode->insertBefore($inputClone, $label->nextSibling);
			} else {
				$label->parentNode->appendChild($inputClone);
			}
		}
	}

	return $dom->saveHTML();
}

Make this example specific to a field or fields by replacing this:

if ( in_array( $field['type'], array( 'checkbox', 'radio' ) ) ) {

with this:

if ( in_array( $field['id'], array( x, y, z ) ) ) {