All options in the official guide have problems (beta/dev ppa, debian repo, ungoogled crashes):
https://linuxmint-user-guide.readthedocs.io/en/latest/chromium.html

http://ubuntuhandbook.org/index.php/2020/06/install-chromium-via-deb-ubuntu-20-04/

Chromium with VAAPI and winedevine:

sudo add-apt-repository ppa:xalt7x/chromium-deb-vaapi

cat <<EOF | sudo tee /etc/apt/preferences.d/pin-xalt7x-chromium-deb-vaapi
Package: *
Pin: release o=LP-PPA-xalt7x-chromium-deb-vaapi
Pin-Priority: 1337
EOF

sudo apt update

sudo apt install chromium-browser chromium-codecs-ffmpeg-extra

sudo ln -s libssh.so.4.8.4 /usr/lib/x86_64-linux-gnu/libssh_threads.so.4