Raspberry Pi + Amazon Echo as a Speaker

I would like to put VLCPlayer on my Raspberry Pi so that I can use things like Big Talker. For my speaker, I would like to use my Amazon Echo.

Unfortunately I have not been successful in being able to pair my Raspberry Pi 3 with the Amazon Echo as a speaker. The Raspberry Pi 3 has built in bluetooth capability and that is what I would like to tap into.

I was able to pair other bluetooth speakers, just not the Amazon Echo.