Use MA Custom Fonts Script with EtchWP

ma-custom-fonts.php

/**
 * 1) Download the Script from https://www.altmann.de/en/blog-en/code-snippet-custom-fonts/
 * 2) Add this to line 395 
 */

// Etch: Add custom fonts CSS to Etch Builder preview
add_filter('etch/preview/additional_stylesheets', function ($stylesheets) {
    if ($this->css_output == 'file') {
        $css_path = $this->fonts_base->dir . '/' . self::SLUG . '.css';
        if (file_exists($css_path)) {
            $stylesheets[] = [
                'id' => self::SLUG,
                'url' => $this->fonts_base->url_full . '/' . self::SLUG . '.css'
            ];
        }
    }
    return $stylesheets;
});