Query not working

My query is not working, i can't get the parentTitle. But if i put the query in the playground Vision of Sanity it works. Maybe something with the character '^'?
```
`*[_type == 'page' && slug.current == '${slug}'][0]{
                    title,
                    components {
                            "parentTitle": ^.title
                    }
                }`
```