I’m using vue-i18n linked messages and I bumped into following error:

{
  person: {
    firstName: 'First name'
  },
  input: {
    placeholder: 'Insert @:person.firstName', // works. Prints "Insert First name"
    ex1: 'Lorem @:person.firstName, hello!', // doesn't work. Prints "Lorem , hello!"
    ex2: "Lorem '@:person.firstName'" // doesn't work. Prints "Lorem '"
  }
}

I tried checking the documentation, but I didn’t find what I was looking for. What am I doing wrong?