How to massupdate report-definitions in i.e RGS621?

Any thoughts on how to mass update RGS-report definitions in Cloud Edition?

I cannot find any API in MRS001 for RGS and I need to mass update RGS621 with GL-account for P&L and BS reports.

Without possibility to insert using SQL I cannot see how to avoid doing this manually, which will be a lot of work.

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I see that this question were entered in the wrong community (XtendM3). Can I change this?

Maybe creating a Custom API in XTendM3 is the solution?