Right now you cannot show the price per person per night in QloApps. This feature is in our roadmap and we will add this feature in our future updates. But right now, we cannot quote a particular time when this feature will be added.
So if you want to add this feature in QloApps right now then you can opt for the Paid Customization.
In the Invoices also we show the number of rooms as the quantity not the number of people. This feature will be also added once the above-mentioned feature is added.
For further discussion on the customization please raise a ticket at https://webkul.uvdesk.com/en/customer/create-ticket/