Can't use a specific brush in animate

In this project I'm doing for work, I'm wanting to use a very specific style for my animation. I made my pose to pose frames in Photoshop and used a charcoal brush. See image attached for the result. 

I cannot find a brush similar to this in Adobe Animate and I can't seem to download them off of Brusheasy like I can for Photoshop. How can I download specific brushes for Animate?