How to get Custom Editor Instance

I having an issue with the custom editor on how to pass the instance parameters, though it's working as expected in the render mode.

renderComponent: CustomComponent,
onComponentInitFunction(instance) {
console.log(`instance: `, instance);
instance.xyz = 'xzy'
instance.xx= 'xx'
},
editor: {
type: 'custom',
component: CustomEditorComponent,
/* issue is here, is there is anyway we can get the current instance and set some extra parameter? */
onComponentInitFunction(instace) {
instance.xyz = 'xzy'
instance.xx= 'xx'
}

Can we get the custom editor instance as it does for rendering?