Set the default value of a Person lookup in powerapps?

I'd just like to set a Person Lookup feild to default to the current user, I've tried using User() and I found a few posts that mention using this formula: 
{
  '@odata.type':"#Microsoft.Azure.Connectors.SharePoint.SPListExpandedUser",
  Claims:"i:0#.f|membership|" & Lower(User().Email),
  Department:"", DisplayName:User().Email,
  Email:User().Email,
  JobTitle:".",
  Picture:"."
}
 
 
But this hasn't worked either. I've set the formula on the data card and the data card value with no luck. Anybody else have this problem? 

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Set the default value of a Person lookup in powerapps?

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