A while ago i ported pm os to mq pro (麻雀 mq pro)
https://wiki.postmarketos.org/wiki/MangoPi_MQ-Pro_(mangopi-mq-pro)
As of now , mq pro (麻雀 mq pro) dont have a pre build image of pm os (bc it is in testing category of pmos).
You can easily make a image of pmos by using pmbootstrap.
https://wiki.postmarketos.org/wiki/Pmbootstrap#Using_pmbootstrap