Any way to put Amazon Fire and old Sony Smart TV into standby

…without using the remote?

My new 4K Amazon Fire TV stick is great, and I love that I can use the new style remote to put my (old, 2011, Sony Bravia KDL46HX803) TV and ( Yamaha YSP-1400) Soundbar into standby with it…

…But… it’d be great to be able to do that via Alexa and/or Alexa.

Does anyone know if that’s possible?