An example of dynamically populating Enhanced Choices from posts

populate_enhanced_choices_from_posts.php

<?php
add_filter( 'gform_pre_render', 'populate_enhanced_choices_from_posts' );
add_filter( 'gform_pre_validation', 'populate_enhanced_choices_from_posts' );
add_filter( 'gform_pre_submission_filter', 'populate_enhanced_choices_from_posts' );
add_filter( 'gform_admin_pre_render', 'populate_enhanced_choices_from_posts' );

function populate_enhanced_choices_from_posts( $form ) {

	// update form and field ID to suit
	$FORM_ID  = 1;
	$FIELD_ID = 1;

	if ( ! function_exists( 'gf_enhanced_choices' ) || $form['id'] != $FORM_ID ) {
		return $form;
	}

	foreach ( $form['fields'] as &$field ) {
		if ( $field->id != $FIELD_ID || ! gf_enhanced_choices()->field_supports_enhanced_choices( $field ) ) {
			continue;
		}

		$field    = gf_enhanced_choices()->field_enable_enhanced_choices( $field );
		$choices  = array();
		$inputs   = array();
		$input_id = 1;

		$posts = get_posts( 'numberposts=-1&post_status=publish' );
		foreach ( $posts as $post ) {
			//skipping index that are multiples of 10 (multiples of 10 create problems as the input IDs)
			if ( $input_id % 10 == 0 ) {
				$input_id ++;
			}

			$choice = array( 'text' => $post->post_title, 'value' => (string) $post->ID );

			$categories     = get_the_category( $post->IO );
			$featured_image = get_the_post_thumbnail_url( $post->ID, 'full' );
			if ( empty( $featured_image ) ) {
				$featured_image = gf_enhanced_choices()->placeholder_image();
			}

			$choice = gf_enhanced_choices()->choice_add_components( $choice, array(
				array(
					'type' => 'image',
					'src'  => $featured_image,
					'alt'  => $post->post_title,
				),
				array(
					'type' => 'pill',
					'text' => ( ! empty( $categories ) ) ? $categories[0]->name : $post->post_title,
				),
				array(
					'type' => 'label',
				),
				array(
					'type' => 'paragraph',
					'text' => get_the_excerpt( $post->ID ),
				),
				array(
					'type' => 'button',
					'text' => "Select",
				),
			) );

			$inputs[]  = array( 'label' => $choice['text'], 'id' => "{$field->id}.{$input_id}" );
			$choices[] = $choice;
		}

		$field->choices = $choices;
		if ( $field->get_input_type() == "checkbox" ) {
			$field->inputs = $inputs;
		}
	}

	return $form;
}