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https://thenewstack.io/power-bi-gets-low-code-datamart-feature/"The datamart feature leverages the Power BI cloud service's dataflow facility, which had already implemented much of Power Query's user interface for the Web browser environment, removing the dependency on Power BI Desktop. But now the full model design experience has also been implemented in the browser. This is a nice option for Power BI users who would like to do everything in the cloud service, rather than splitting their efforts between there and the desktop."
https://ssbipolar.com/2022/05/25/dataflows-with-benefits/Lastly two guys and a cube have a few videos on the subject of datamarts on youtube. I haven't watched them to know what if any value they provide but I know they are out there.