In your case you just need to escape \$VERSION to avoid the GString to be 
interpolated. 

sh "find packages -name internal-* -type d -exec bash -c 'for arg; do 
export VERSION=\$(grep \${arg##*/} nexus-cicd-versions.txt | cut -d: 
-f2);sed -i \'s/#VERSION#/\${VERSION}/g\' \$arg/0/package.json; done' _ {} 
+"


But again, GString might be a bit tricky when escaping in the sh step 
within the  jenkins pipeline

Cheers

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