To the best of my knowledge, which might well be outdated, it is not possible to plug a USB microphone into a an Android device and simply operate it like the system microphone. At least some years ago every app had to explicitly implement the support. If this is still the case, it makes implementing such support less attractive for vendors of specialised software, like LinkPlay.
It's seems not to be as straight forward as with iOS devices. Dayton Audio for example does offer
a calibrated USB mic for iOS and Android, but rather vaguely speaks of plugging "it into the USB-C of a
supported device" in the quick reference guide (no real user manual available). Nubert is offering
a dedicated measuring microphone for products like the
nuConnect ampX Smart Amp (but chose to misleadingly name it an "Audio Interface" and explicitly recommend using an iPhone when possible).
I don't pretend being an expert in this field, so I will happily wait what WiiM is going to offer.