Example code for caldera_forms_render_form_attributes filter. See: https://calderaforms.com/doc/caldera_forms_render_form_attributes/

caldera_forms_render_form_attributes.php

<?php
/**
 * Indicate to screen readers and other assistive devices that a Caldera Form is being used as a search form.
 */
add_filter( 'caldera_forms_render_form_attributes', function( $form_attributes, $form ){
    $form_attributes[ 'role' ] = 'search';
    return $form_attributes;
}, 15, 2 );