How can you query on nested key value pairs?

How can I query in Loki/Promtail a nested key value pair like this one:

[{"action":"allowed","reason":"","reason_extra":"","delivered":"delivered","delivery_detail":" 2.0.0 Ok: queued as 6F/89-18578-5391D421","email":"","taxonomy":"none"}]

…or do I need to parse this in the promtail config pipeline stage?

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