FastReport custom object as Datasource

Question

hello 

i developed a simple print report in FastReport to print some details in table object
now i want to let my users to design and adjusment their print report so i store report xml in database and load in FastReport Designer to user.
now to bind information in table
we must add datasource in designer from database only and after that a connection is open and select all records to user and ...
my problem is that i want to use Custom Entity Object as Datasource for report not database table how can i do that?
so if possible when user open report designer he can adjust coulmn remove or add and drag new columns from datasource to report table and when save that report .
i run print by passing list to RegisterData function of report and it ok.