It is not OOTB, but you could easily create som Java Callouts to be able to send ActivityEvents into an EmbeddedCollector, that could send it to the ActivityServer. Of course, this work is not done, but could be done by you and contributed back. If you are interested, you can ask for details.
Alternatively you can also report the activity events direct to the REST API available on the server. The benefit of the approach mentioned by Jorge is that the embedded collector can perform some pre-processing on the events, trigger client side (activity validator) policies that could potential block the business txn (if inline) and batch up the events to send to the server more efficiently.