how to use Cloudformation Parameters with Ref in UserData from_file

I'm loading the userdata from bash file that contains AWS Refs Parameters, I'm using from_file function (from helpers). For instance:

my_userdata.sh:
...
{ "Ref" : "mykey" }
...

deploy.py:
...
dir = os.path.dirname(__file__)
filepath = os.path.join(dir, 'my_scripts/')
file = os.path.join(filepath, 'my_userdata.sh')

launchconfig = t.add_resource(LaunchConfiguration(
name,
...
UserData=from_file(file, "")
))
...

When I print my json template generated from troposphere, I see unnecessary escaped characters and the stack deploy fails

print(t.to_json())
...
{ \"Ref\" : \"mykey\" }
...

Can I avoid the transformation of the Cloudformation Refs?