Populate ACF select field options with Gravity Forms to select a specific form

acf-gravity-forms-field.php

<?php
/**
 * Populate ACF select field options with Gravity Forms forms
 */
function acf_populate_gf_forms_ids( $field ) {
	if ( class_exists( 'GFFormsModel' ) ) {
		$choices = [];

		foreach ( \GFFormsModel::get_forms() as $form ) {
			$choices[ $form->id ] = $form->title;
		}

		$field['choices'] = $choices;
	}

	return $field;
}
add_filter( 'acf/load_field/name=submit_project_gf_form_id', 'acf_populate_gf_forms_ids' );

Thank you psaikali! This was so helpful for me. I was getting a php warning (running php 8+) with the original code, so I'm offering this version that worked for me.

*Note to others: remember to change 'your_field_name' to whatever you named your ACF Select field.

// Populate ACF select field options with Gravity Forms forms 
function acf_populate_gf_forms_ids( $field ) {
    if ( class_exists( 'GFFormsModel' ) ) {
        $choices = array(
            'none' => 'None'
        );

        $forms = \GFFormsModel::get_forms();

        if ( $forms ) {
            foreach ( $forms as $form ) {
                $choices[ $form->id ] = $form->title;
            }
        }

        $field['choices'] = $choices;
    }

    return $field;
}
add_filter( 'acf/load_field/name=your_field_name', 'acf_populate_gf_forms_ids' );

Here's the PHP code to render the shortcode:

<?php 
	$form_id = get_field('your_field_name');
	if ($form_id && $form_id !== 'none') {
	    $escaped_form_id = acf_esc_html($form_id);
	    echo do_shortcode("[gravityform id=\"$escaped_form_id\" title=\"true\" description=\"true\" ajax=\"true\" tabindex=\"4\" theme=\"gravity\"]");
	}
?>

*Edited to set the default field to "none"