ksoap2-android: Need to put raw XML as value without escaping special characters

I'm using ksoap2 to consume a SOAP WS. The only thing I need from the library is to authenticate the envelope and communicate to the WS, the "body" xml is generated from objects using Simple-xml elsewhere.

So, what I need is to put the xml (that has been passed as a string) as a value, but ksoap2 escapes my xml tags with &gt and &lt.

I've searched here and the most similar question I've found is this one which points here (official documentation) which points here (old forum which requires login and may not longer exist). Anyway, I don't want to marshall an object again, my structure is pretty big and it also includes a signature and I have already resolved all that with another library.

So, the actual question: Is there any way in ksoap2-android to avoid escaping xml in a string?