You can disable binding expression type checking using $any() type cast function(by surrounding the expression). In the following example, the error Property contacts does not exist is suppressed by casting user to the any type.
template:
'{{ $any(user).contacts.email }}'
The $any() cast function also works with this to allow access to undeclared members of the component.
template:
'{{ $any(this).contacts.email }}'
