There is no way to put AdditionalData in Sentry with LogEvent

[PsiHamster]

As Wiki says you can put non-primitive type like Container or Vector as Additional Data in Sentry.
Or use stackTrace hercules-tag to put string as additional data.

But when it's coming to hercures https://github.com/vostok/logging.hercules in any case all properties are flattened

Otherwise the value gets converted to string: either stringified directly (if it properly overrides ToString()) or serialized to JSON. No further container-like structure is allowed, all values end up being 'flat'.