Hi
I understand you're using TypeScript, but how is Power BI consuming it ? Via 'web' http ? In other words, what do you do when you select 'Get Data' ?
We have encoded data in JSON using python then into Power BI successfully Yes, we have had issues with maximum rows, but that has also been a server side limitation rather than Power BI. However, I have not see your error message before.
Cheers,
D