Install this version:
emerge -a =media-fonts/meslo-nerd-9999
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =media-fonts/meslo-nerd-9999
Or alternatively:
emerge --autounmask-write -a =media-fonts/meslo-nerd-9999
# Copyright 2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=7
inherit font
DESCRIPTION="Customized version of Apple's Menlo font, patched by romkatv"
HOMEPAGE="https://github.com/romkatv/powerlevel10k-media"
SRC_URI="
https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Regular.ttf
https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Bold.ttf
https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Italic.ttf
https://github.com/romkatv/powerlevel10k-media/raw/master/MesloLGS%20NF%20Bold%20Italic.ttf
"
LICENSE="Apache-2.0"
SLOT="0"
KEYWORDS="~amd64 ~x86 live"
FONT_SUFFIX="ttf"
S="${DISTDIR}"