1. Install this plugin by uploading to wp-content/plugins
2. Create flex-content.php file in your active theme

sa_flex_content_post_type In which post types Flexible Content will be used default: ['post']

sa_flex_content_field_name Flexible Content field name default: 'flexible_content'

sa_flex_content_template_file File in which all the magic happens - read more here https://www.advancedcustomfields.com/resources/get_row_layout/ default: get_template_directory(). '/flex_content.php'

$flex[ 'fields' ] = get_row( true );

if ( 'text' == get_row_layout() ) {
    $tpl = 'text';
} elseif ( 'osoba' == get_row_layout() ) {
    $tpl = 'person';
} 

Timber::render( 'views/flex/'.$tpl.'.twig', $flex );
unset( $flex );