Sideloading Tags for a Contact with v3

I’d like to query all of the assigned tags for a single contact in one API request. Is that possible to do with sideloading when the relationship is 3 levels?

Contact → ContactTags → Tags

What would the correct syntax be for the query string?
/api/3/contacts/1?include=contactTags.tag

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It is not currently possible to sideload tags in the API call to retrieve a single contact.

I’m new to using ActiveCampaign’s API. It feels to me that version 3 lacks features and its development is lethargic. I’m wondering whether to stop investing my time in it and develop using version 1 or 2 instead. Has anyone else come to a conclusion on this?