From this place, can't move forward
(chroot) # emerge linux-firmware networkmanager
I get this (the end part of it)
The following USE changes are necessary to proceed:
(see "package.use" in the portage(5) man page for more details)
# required by sys-auth/polkit-0.113::gentoo[-systemd]
# required by net-misc/networkmanager-1.0.6-r1::gentoo
# required by networkmanager (argument)
>=sys-auth/consolekit-0.4.6 policykit
Use --autounmask-write to write changes to config files (honoring
CONFIG_PROTECT). Carefully examine the list of proposed changes,
paying special attention to mask or