ACF - Populate Dropdown in Repeater Field - with Post Name and ID

functions.php

<?php
/* 
https://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/#example-2
*** CHANGE ***
- child_field (this is the dropdown inside the repeater field)
- post_slug
*/  
function acf_pre_populate_repeater_dropdown ( $field ) {
    $field['choices'] = array();
	  $args = array('post_type' => 'post_slug');
	  $the_query = new WP_Query( $args );
  	if ( $the_query->have_posts() ) {
      while ( $the_query->have_posts() ) {
        $the_query->the_post();
        $value = get_the_ID();
        $label = get_the_title();
        $field['choices'][ $value ] = $label;
      }
    } else {}
  	wp_reset_postdata(); 
    return $field;
}
add_filter('acf/load_field/name=child_field', 'acf_pre_populate_repeater_dropdown');