Using Jetpack’s Markdown with Timber https://matthewspencer.me/notes/using-jetpacks-markdown-with-timber

01-twig-filters.php

<?php

/**
 * Twig filter for converting Markdown
 *
 * @uses Jetpack
 * @uses WPCom_Markdown
 */
add_filter( 'get_twig', function ( $twig ) {

    $twig->addFilter( new Twig_SimpleFilter( 'markdown', function ( $text ) {

        if ( ! class_exists( 'Jetpack' ) || ! Jetpack::is_module_active( 'markdown' ) ) {
            return $text;
        }

        jetpack_require_lib( 'markdown' );

        return WPCom_Markdown::get_instance()->transform( $text, array( 'unslash' => false ) );

    } ) );

    return $twig;

} );

02-post-content.twig

{{ post.post_title|markdown }}