Found this archived post when looking why x wasnt showing the revolution slider options:
https://community.theme.co/forums/topic/missing-revolution-slider-option-in-edit-posts-to-select-slide-templates/
Its actually very easy to implement. I added this to functions.php in child theme and voila 🙂
if(is_plugin_active('revslider/revslider.php')){
if(class_exists('RevSliderAdmin')){
RevSliderAdmin::addMetaBox("Revolution Slider Options",'',array("RevSliderAdmin","customPostFieldsOutput"),$postTypes);
}
}