They already did that back in January when they announced a node.js integration with ChakraCore [0].
https://blogs.windows.com/msedgedev/2016/01/19/nodejs-chakra...
https://blogs.windows.com/msedgedev/2016/01/19/nodejs-chakra...
https://winblogs.azureedge.net/win/2016/01/nodejs-benchmark-...
It looks like they perform better on 50/675 tests, and worse on 500/675 tests. That is not particularly compelling. Since that was a while ago now, I really would prefer to see where improvements have been made.