Apache - Handle .html, .htm as PHP?

I’m trying to configure Apache (2.4) in Devilbox to send .html and .htm files to the PHP handler.

I have tried this using an .htaccess (to no avail) file by adding:

AddType application/x-httpd-php .html

And also by trying similar in Devilbox’s cfg/php-ini-#.#/ ini file… also to no avail.

Anyone know how this is correctly done within Devilbox?