Support automatically collected properties by Google Tag Manager

[ssohymind]

Hi, I'm one of the users of this library.

Since I thought this would be great alternative to the GTM to track GA events, I migrate all my GTM event Tags to code.
However, I found the automatically collected properties when using GTM are not logged with some custom events such as campaign, source, medium, ga-session-id, etc.

I wonder whether it is the original intention of this library or I'm doing something wrong.