You will probably have to do it yourself. But it might be simpler to do on a real computer running Linux.
The closest thing to that I have seen (but I have certainly not seen everything) is a "driver" some of the forum members wrote for the FLIROne on Linux using v4l2loopback in the early days of [IIRC] the "Question about FLIR One for Android" thread.
v4l2loopback creates virtual video devices in the /dev directory & these can be written to & read by video4linux compatible programs which would normally read or write from/to hardware devices. I tried unsuccessfully to use its predecessor "vloopback" once but have not used the current package.
According to one respondent on this page, v4l2loopback should be installable on Android...OR at least Androidx86:
https://groups.google.com/forum/?_escaped_fragment_=topic/android-x86/MGjbgooOsyM#!topic/android-x86/MGjbgooOsyMYou would have to write an app that would write the thermal camera output to the virtual video device created by v4l2loopback & the Skype app would have to be able to select that device for input rather than the phone's camera.