V-model conditional

Hello,

i have a field with a v-model on a create form:

<field
 v-model="entity.color"
...
</field>

The entity is initial null. So how do i setup a default value for entity.color

data() {
 return {
    entity: {
      color: 'red' 
    } 
  } 
} 

@ecofriend thx