String template for models

We have table of articles:

id	title	seo_title	created_at
1	Game of Thrones: New Episode		2019-05-13 18:04:43

and we need to show title of Article page with specific template, for example {title}. Published at {date}.

$.ajax({
    url: '/articles/1',
    type: 'patch',
    dataType: 'json',
    data: {
        seo_title: '{title}. Published at {date}'
    },
    success: res => {
        console.log(res.data.seo_title) //Game of Thrones: New Episode. Published at 2019-05-13 18:04:43
    }
});

But if we want edit this Article, we will see original text:

$.ajax({
    url: '/articles/1/edit',
    type: 'get',
    dataType: 'json',
    success: res => {
        console.log(res.data.seo_title) //{title}. Published at {date}
    }
});