Hi @Mr Edge
A similar question was asked on Stackoverflow at https://stackoverflow.com/questions/69108106/best-way-to-export-firebase-into-azure-sql
The easiest way is to use "WAY 3" (which states that you need no coding experience) suggested by SwethaKandikonda which is a 3rd party tool called Improvado found here.
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If this is helpful please accept answer.