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This page is very helpful: https://support.apple.com/en-us/HT211983

i='Install macOS Big Sur.app'

s='SharedSupport'

d='http://pathto/InstallAssistant.pkg'

cd '/Volumes/Untitled'

mkdir -p private/tmp

cp -R '/$i' private/tmp

cd 'private/tmp/$i'

mkdir Contents/$s

curl -L -o Contents/$s/$s.dmg $d