Creating custom functionality in Lithium Studio

Assuming that my community is hosted on the Lithium servers and I create a new page via Lithium Studio, can I add Javascript to my new page that accesses the REST API?

For example, assume that I want a custom page that allows me to create a single message that is submitted to 5 different threads at the same time.  While this is not useful functionality, it would be easy to do if I have access to the REST API via Javascript.

Thanks.