Migrating Jasper Reports to SpagoBI Server - jasper-reports

I have two servers running:
The first one is a Jasper Server with multiple working reports.
The second one is a freshly installed SpagoBI Server.
Now the Jasper Server should not longer be used and the reports need to be migrated on the SpagoBI Server.
Is there a way to transfer/convert the reports easily?
My prefered (but naive) solution would be a simple ex- and import but unfortunately I haven't found such an option yet.
Another way that comes to my mind, could be using the clients (iReports/SpagoBI Studio).
With iReports I can access the repository of the Jasper Server but unfortunately I can't connect it to the SpagoBI Server.

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