Yes you can but it wont reflect in the output of Report Studio..you can embed the JSP code within the HTMLItem..and save the HTML type output of the report within a folder of you JSP Webserver which hosts your JSP pages..you can achieve this using a java code..i.e. generate the report asynchronously..using your JSP page call the HTML report..which can be saved as a .jsp file in the webserver using the java code..which will now act as a JSP page..hope this helps..
Darren