I have a solution partially working: Mind you, it is a workaround until Tealium comes up with a proper tag template (bump ladies and gents...). Don't make me spin up a custom tag template for it, please. However, I set up a gtag template, added a simple load rule and some custom mappings. Most of the event-related built-in property mappings concerning web & app don't work. Some config settings work (I tested page_title, page_path, content_id). As longs as only one gtag exists on a page, things run smoothly. You can supress the automatically triggered page_view from web & app if required ( I do that in a custom extension scoped to the tag and I adjusted the gtag template slightly). I invoke a custom pageview event in my extension to add a bunch of properties to it. You can't add custom properties to the default page-view event unfortunately. Once you have multiple gtags running on the page, things become messy because every click which is triggered by extensions scoped to other gtags is now automatically triggered by the web & app gtag again. (*sigh*). I haven't found a solution to suppress this behavior yet. It inflates the events measured on other GA properties. As soon as I have found a working solution, I'll update it here. I need some spare time to look into this more thoroughly.
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