Change Connection from PowerPlatform to Something Else

I have a couple of reports which my manager wants Publishing to Web (public).

As these reports are very similar, I created a single dataset and then created the reports by connecting to that dataset.

Unfortunately publish to web doesn't support Shared Datasets, so I now need to change these reports so that they have their own dataset.  I can change the data source to another Dataset in PowerPlatform easily enough, but how do I remove the dataset so that I can build a new model within the report?