2.8 is working for me.
To install it I think you have to use xdowngrade. Like this:
sudo xdowngrade freetype-2.8_1.x86_64.xbps
You have to take a look inside the wiki. I think xdowngrade is part of something like xtools.
And don’t forget to put it on hold (there is also a tool for that in these xtools) so that the next update does not install 2.8.1
For reference regarding xtools: https://github.com/chneukirchen/xtools
Oh and you can hold the package via xbps-pkgdb. That is explained in one of th previous threads.