Allow to import the custom field data from RSTickets!Pro (in joomla user integration function)

Using "joomla user integration function" (in RSMail), we would like to have the integration of further fields, in order to have distribution lists with more details. (so you can filter by different types of customers).

We need Allow to import the custom field data from RSTickets!Pro (for example our "customer type" field).

THX