Vuejs 3 ("vue-meta": "^3.0.0-alpha.8")

On my vue page i'm trying update title like that:
data() { title: 'title' }, setup () { useMeta({ title: this.title }); }, created() { this.title = 'New title' }

ang get: Cannot read properties of undefined (reading 'title')

How i can fix that? Thank you!