Hi @AndyDCutler,
Welcome to Microsoft Q&A Platform. Thanks for posting the query.
I checked the past conversations with the Product team about this and got confirmed that Azure Data Factory (ADF) does not support writing to model.json file. Also, I observed that there is discussion on Power BI team to add manifest option. I would recommend you to add ideas in ADF feedback forum and Power BI forums that are closely monitored by the product teams and will be implemented in future releases.
Hope this helps! Please suggest for further queries and we will be glad to assist.
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