How to pass data and data to the animation function?

Question

JavaScript

I'm using Nuxt, I need to execute a function when going to a page. The bottom line is that I need to take data from the data of the current page, I can’t figure out how.
An example of what is:

export default {
transition: {
          name: 'test',
          leave: function (el) {
              //тут мне необходимы данные из data текущей страницы, но я не понимаю как передать сюда this
          }
        },
data () {
            return {
                testCounter: 0,
            }
        },
}

Do not understand the logic ... Please help, thank you!