The ArcGIS maps for PowerBI plug in does not allow for you to create lines.
If you publish your pipeline data to your ArcGIS Online, you can add the layer to your map as a reference layer or as a basemap.
This would be the better route because you could define the symbology in the web map meeting the requirements of specifying widths and it would support points, lines, and polygons.
You could then layer in your points later if you want to create visuals/charts from the data.