Allow HTML in a specific form field

<?php
// allow HTML in a specific form field
// update the '344' to the ID of your form
add_filter( 'gform_allowable_tags_344', 'hearts_welcome_here', 10, 2 );
function hearts_welcome_here( $allow_html, $field ) {

    // update the '2' to the ID of your field
    if( $field['id'] == 2 )
        return true;

    return $allow_html;
}