Is it possible when registering several json files to overwrite the previous key contents with latest file?

[halafi]

Is your feature request related to a problem? Please describe.
Imagine I have:
en.json
en-overrides.json

I load en.json first and then en-overrides.json

en.json:

{
"foo": ["bar"]
}

en-overrides.json

{
"foo": ["baz"]
}

what happens is key foo will contain ["bar", "baz"] is there a possibility to change the behavior?
Describe the solution you'd like
Maybe when calling register define the desired behavior "merge", "latest", "first" etc.

How important is this feature to you?
Maybe this is already possible but will appreciate early response.