How to pass parameters to lang from js?

PHP Code:

{
    'data': data => [
        moment(data.published_date).format('DD/MM/YYYY'),
        moment(data.published_date).format('HH:mm'),
    ].reduce(
        (acc, value, index) =>
            acc.replace(`{${index}}`, value),
        data.status === 'draft' ?
            <?=json_encode(lang('blog.post.last_update'))?> :
            <?=json_encode(lang('blog.post.published_on'))?>
    )
}, 


This might work. It's not clear what format data.published_date is in.