2 years late, but the answer is yes, it is possible for example by doing an http request.

See: viewtopic.php?f=17&t=8605&p=69242#p69242

Here is a simple way to set the animation:

// 6 = Fireplace
http://localhost:8080/json.htm?type=command&param=applyzwavenodeconfig&idx=10&valuelist=72_Ng%3D%3D
// 7 = Storm
http://localhost:8080/json.htm?type=command&param=applyzwavenodeconfig&idx=10&valuelist=72_Nw%3D%3D
// 8 = Rainbow
http ...