Create a predefined lists

Yes, there is an action for this in classes/fields/pick.php.

For example:

<?php

add_action(
	'pods_form_ui_field_pick_related_objects_predefined',
	function(){
		PodsField_Pick::$related_objects['pokemon'] = array(
			'label'         => __( 'Pokémon', 'pods' ),
			'group'         => __( 'Predefined Lists', 'pods' ),
			'simple'        => true,
			'data_callback' => 'predefined_list_pokemon_data',
		);
	}
);

function predefined_list_pokemon_data( $name = null, $value = null, $options = null, $pod = null, $id = null ){
	return [
		'Bulbasoar',
		'Charmander',
		'Squirtle',
		'Mew',
		'Mewtwo',
	];
}