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The docs state you can add them after the comma like this:
this.$q.dialog({
component: CustomComponent,
// optional if you want to have access to
// Router, Vuex store, and so on, in your
// custom component:
parent: this, // becomes child of this Vue node
// ("this" points to your Vue component)
// (prop was called "root" in < 1.1.0 and
// still works, but recommending to switch
// to the more appropriate "parent" name)
// props forwarded to component
// (everything except "component" and "parent" props above):
text: 'something',
// ...more.props...
Source:stackexchange.com