If you are willing to add a “Room” as a Price Per option under the pricing category then WP Travel plugin provides the feature regarding adding a room as a Price Per option under the pricing category using a filter code.

To add a “Room” as a Price Per option under the pricing category, please add the following filter given code in the functions.php file of your child theme.
function example_callback( $example ) {
return array(
array(
'label' => __( 'Person', 'wp-travel' ),
'value' => 'person',
),
array(
'label' => __( 'Group', 'wp-travel' ),
'value' => 'group',
),
array(
'label' => __( 'Room', 'wp-travel' ),
'value' => 'room',
)
);
}
add_filter( 'wp_travel_trip_price_per', 'example_callback' );
For detailed information regarding “how to create a child theme?”
Kindly, please refer to the Knowledge base to be clear more precisely,
After adding the Filter code:

Also, if you want to learn more about the filter hook that is used to rename fields on the checkout page, then, referring specific hook page will help you be more concise about every step.
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You may find it useful:
How to display content under the trip price on the single trip page in WP Travel Plugin?
How to add multiple pricing categories in a single price in WP Travel Plugin?
How to add different prices for multiple categories in WP Travel Plugin?

WP Travel is Best Travel Booking WordPress Plugin, a Free and Powerful Tour Management Engine (available in the PRO version with additional features) for making customized travel agency or tour operator websites on WordPress in minutes!