Not totally tested yet examples of how to use Caldera Metaplate 0.3.0-b1 https://github.com/CalderaWP/caldera-metaplate

metaplate-from-file.php

<?php
/**
 * Load the template data from a file (file must be .html or .htm )
 */
//load from child theme or parent theme
$file = 'template.html';
echo caldera_metaplate_from_file( $file, $post_id );

//or use absolute patth
//$file = __FILE__ . '/template.html';
$file = dirname(__FILE__) . '/template.html';
echo caldera_metaplate_from_file( $file, $post_id );

//above examples willl pull meta fields by $post_id
//alternatively pass an array of data to use with third arg
$file = 'template.html';
$template_data = array(
	'hats' => 'Many Hats',
	'shoes' => 'No shoes',
	'shirts' => array(
			'blue',
			'red'
		)
	);
echo caldera_metaplate_from_file( $file, null, $template_data );

metaplate-inline-data.php

<?php
/**
 * Define a template in PHP and render with a Post's data.
 */ 
$metaplate[ 'html' ][ 'code' ] = 'Title: {{post_title}}<br />Shoes: {{shoes}}';
echo caldera_metaplate_render( $metaplate, 42 );
//note that the second argument ^^ is post ID, and is optional when global $post is set.