[Is there a way to Taper Vector Lines?]

Hello, I wanted to ask if anyone knew of a good way to taper vector lines made with the Pen Tool in Affinity Designer. 

 

I know that you can do it on Inkscape and Illustrator, but I haven't figured out a way to do with Affinity. 

Also, I know that I can you the brush tool to get that sort of line with a graphics tablet, but I just want to see if I can do it with the pen tool. 

Here is a link to article of that shows how its done Inkscape so you can get a better idea of what I am asking. 

http://design.tutsplus.com/tutorials/quick-tip-how-to-create-tapered-lines-in-inkscape--vector-23746

 

Thank you!