How do I use a period in a field name, without creating a nested object?

I have a field that is using a period in it. But if I put a period in Mockaroo, it automatically breaks this down into a nested object. Is there a way I can use an escape character or something so that Mockaroo can ignore a period?

Here is an example of the of the field name I need to use:
"baseTypeForInterfaceProxy.AssemblyQualifiedName"

In this case the name of the field would need to be exactly as stated, and Mockaroo would need to not break this down into a nested object.