Hi Lukas,
Mendix Pages can only have one so called context object. However that does not mean you can not have multiple data views on a page with different data sources see https://docs.mendix.com/refguide/data-view#data-source We often use additional data views on the page with a microflow data source.
Hope this helps, Andrej
You can have as many datagrids, dataviews, template grids, and listview on one page as you like.