Automatically Populate Gravity Forms from Posts, Events, etc.

functions.php

// Add scripts for Gravity Forms
gravity_form_enqueue_scripts( [gformid], true );

// Call function to add form to bottom of the entry
// *** This only works if you're using a Genesis theme ***
add_action( 'genesis_entry_footer', 'add_form_to_bottom', 5 );
// Return Gravity Form with specified ID to single listing CPT
function add_form_to_bottom() {
	// bail if we aren't on a single listing CPT
	// Change 'listing' to post type
	if ( ! is_singular( 'listing' ) ) {
		return;
	}
	// display Gravity Form
	gravity_form( [gformid], true, false, false, '', false );
}

//use "gform_field_value_[parameter-name]"
add_filter( 'gform_field_value_property_name', 'populate_post_title' );
function populate_post_title( $value ) {
	// bail if we aren't on a single listing CPT
	// Change 'listing' to post type
	if ( ! is_singular( 'listing' ) ) {
		return;
	}
	// fetch the post title
	$title = get_the_title();
	// return value escaped
	return esc_html( $title );
}