Hreflangs in Rest Api

Hi there, I have a list of translations on the Rest Api response. But also I need to fetch hreflangs (just slugs) through the Rest Api based on the translations list. I tried it by editing the plugin but can’t succeed so far.

For example is it possible to do something like this ?

{
    "translations": {
        "nl": 1822,
    },
    "hreflangs": {
        "nl": "post-slug",
    },
}

Thanks for any help