JasperReport Server how to set properites

Dear community,

I got question about report properties. I have Jasperreport server integrated with my app using IFrame integration. One of my requirement is to add to PDF metadata some information from the system about login user ect.

I know that there is a special properties for this purpose:

• net.sf.jasperreports.export.pdf.metadata.title
• net.sf.jasperreports.export.pdf.metadata.author

I can set the properties in static way but I could not find way to set it via parameter or field.
There is no any way to configure it as URL server parameters.
Do you have any idea how to configure it dynamically.

Or meybe there is other way to put the metadata to exported PDF.

Thank you for help!