Enqueue HTML snippets using WP Dependencies API

enqueue-html.php

<?php

add_action( 'init', array( 'Enqueue_HTML', 'get_instance' ) );

class Enqueue_HTML {

	public $scripts = array();

	protected static $instance;

	public static function get_instance() {
		if ( self::$instance === null ) {
			self::$instance = new self;
		}
		return self::$instance;
	}

	public function __construct() {
		add_filter( 'script_loader_src', array( $this, 'loader_src' ), 9, 2 );
		add_filter( 'script_loader_tag', array( $this, 'loader_tag' ), 9, 3 );
	}

	public function loader_src( $src, $handle ) {
		$str_src = preg_replace( '/^[^<]*(<script.*?<\/script>).*$/sm', '$1', $src );
		if ( strpos( $str_src, '<script' ) === 0 ) {
			$this->scripts[ $handle ] = $str_src;
		}
		return $src;
	}

	public function loader_tag( $html, $handle, $src ) {
		if ( isset( $this->scripts[ $handle ] ) ) {
			return $this->scripts[ $handle ];
		}
		return $html;
	}

}

example.php

<?php

add_action( 'admin_enqueue_scripts', function() {
    
    // backbone template
    wp_enqueue_script( 'html', '
        <script type="text/html" id="example-backbone">
			<div class="my-template" style="left: 0;">
				<h1>{{ data.title }}</h1>
			</div>
        </script>
    ', array( 'jquery' ) );
    
} );