Cant get SQL queries from PBI Report Server database

[JernejaPi]

Hi experts,

I am trying to find SQL queries wihch are the source of the micro data for the PBI reports storred in ReportServer database. I found this conversationWhere Can I find the published report in PowerBI Server usefull, but does not cover all my needs. 

Does anyboady know how to convert ReportServer.dbo.CatalogItemExtendedContent.Content field where ContentType='CatalogItem' to get the data source SQL queries or how to change powershell script from @Anonymous  in link above to get the content of the DataMashup file from the PBI.zip file?

Thanks in advance,

Jerneja