I did notice in (and have since up-voted) that UWP support for GetStream appears unavailable, hopefully that is prioritized in to a release soon.
BKBharathiraja K Syncfusion Team May 17, 2019 07:11 AM
We would like to let you know that GetStream support for chart UWP is already included in our recent release 2019 Volume-1(18.104.22.168). We have prepared a sample for convert Chart to PDF using GetStreamAsync() method. For more details please refer below link.