Feature: Add context and context list variables

[volderette]

I've used this snowplow gtm template before and found it really helpful to have a context variable template. It would be great to integrate something similar in the snowplow gtm templates as well.

Link to repo with example templates:
https://github.com/mmathias01/snowplow-gtm-templates

[sahava]

Good idea - so basically variable templates to replace the need to use a Custom JS variable for returning the context arrays/objects?

[volderette]

Yes, exactly. This is an example of the mentioned templates: