PySide2 is already available through pypi however an increasing number of people especially users of scientific tools are using conda to install and manage their python packages and environment. Having PySide2 there would be a great addition since currently only PyQt is available.
Work was already done for PySide 1 at some point. You can find the recipe on the corresponding conda pyside feedstock GitHub repository. It might be enough to just copy it and start from there.
Using `conda skeleton pypi PySide2` won't work due to the nature of the package, it fails when trying to download the archive corresponding to the release.
Note that making it available through the defaults channel would be better if possible as it is the mainstream channel.