ACF Choises

functions.php

function acf_load_cats_choices( $field ) {
	// reset choices
	$field['choices'] = array();
	// get the textarea value from options page without any formatting
	$choices = get_hubspot_data( false, true );
	// loop through array and add to field 'choices'
	if ( is_array( $choices ) ) {
		$field['choices']['0'] = 'All';

		foreach ( $choices['topics'] as $key => $choice ) {
			$field['choices'][ $key ] = $choice;
		}
	}

	// return the field
	return $field;
}

add_filter( 'acf/load_field/key=field_5c8be31281dfa', 'acf_load_cats_choices' );