Make Staff Member plugin properly work with the Invoice and Tax plugin

I have several staff members that are offering services on my website. After a customer booked and payed for a service, they automatically receive an invoice.
As every staff member works on their own responsibility and with their own license, the invoice needs to contain additional information on the respective staff member that provides the service.

These information include

• Name of the staff member (already implemented)
• Address of the staff member, including c/o line, street & number, postal code, city, country
• Staff email and phone (already implemented)
• Staff tax number
• Staff tax rate (as this can be different between staff members)
• Staff additional information (e.g., license number for medical services)
• Staff additional customizable information, e.g., personalized greeting line

Can you please add the respective fields in the staff member administration and add variables that may be used in the notification emails & invoice plugin? Also, please make the staff member tax rate override the general tax rate defined in the tax plugin.
Thank you!