how to add a third package to android for android 9.0 for imx8qxp. does it have any document?

[controlyourself]

imx8qxp,   android 9.0 ,   how to add a third package to android for android 9.0 for imx8qxp. does it have any document?

thanks.

[joanxie]

what third package do you want to install?