Divi | Add more font weights to existing Google Font options

divi-update-font-weights.php

<?php 

// add more font weights
add_filter('et_builder_google_fonts', 'my_custom_google_fonts', 10);
function my_custom_google_fonts($google_fonts) {
	$google_fonts['Montserrat']['styles'] = '300,300i,400,400i,600,600i,700,700i';
	return $google_fonts;
}