How to remap the ENTER key on a Chromebook?

I have a Chromebook and the Enter key broke. It doesn't work at all when pressing it, which of course is quite a bit of an issue. For now I use an external keyboard but this is rather annoying when on the road. Can I somehow remap the Enter key? For instance, making the right Shift behave as if it were the Enter key would be really useful.

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