[PHP APM Agent] - span support for SOAP APIs?

We just started leveraging some of APM on our Elastic cluster, and it is going well so far except for one thing. We have multiple services that interact with different APIs via the SOAPClient class that is built into PHP.

It seems that the PHP agent only support curl and Guzzle at the moment, anyone know if the support is planned or if there is a workaround of some kind?