How to install libnss3 libasound2 on manjaro?
XY Problem detected. You’re asking about your attempted solution rather than your actual problem. This leads to enormous amounts of wasted time and energy, both on the part of people asking for help, and on the part of those providing help.
Until you tell us what the X Problem is, a side note: you cannot install debian packages on manjaro directly, because it is not based on debian. If your app is not made for arch and not in the repo or aur, look for flatpak, snap, or appimage version of it.
That said, the equivalent libraries libasound.so.2 is part of the package alsa-lib, and libnss3.so is part of nss.
alsa-lib is installed and provides libasound
pamac list -f alsa-lib | grep libasound
nss provides libnss3
pamac list -f nss | grep libnss3