External library - reportlab

Hello guys. I need to add to blender script external library - reportlab (http://www.reportlab.com/) for export some PDF files from blender. I’ve got some code which is functional in Pycharm for example, but I need to import this library in blender.

Here is an example of code which I want to run from blender.

from reportlab.pdfgen import canvas

c = canvas.Canvas("hello.pdf")
c.drawString(100,750,"Hello PDF")

How to add reportlab library to blender ? Thank you for your answers