You can get data from API with Power Query in Power BI Desktop. I assume your web service returns a JSON. You can format the JSON into a Table format. Then you can populating this dataset into any visuals you created. Please refer to articles below:
Visualizing and exploring the results of your Azure Machine Learning Studio (ML Studio) experiments is useful both when developing and evaluating the model but most importantly when deploying your model and presenting the results. With Power BI Desktop this can be done in two ways, either by writing the results from the model to a database that you then connect Power BI to, or by using an R script visual (Rviz).