Perhaps regrettably, no, it cannot. The whole point of end-to-end-encryption is that messages cannot & will not be read by someone the sender did not intend. Any app which makes messages available for third-party oversight, isn’t end-to-end secure.

For slightly more technical discussion, see this blog post.

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But what about warranted access?

See this blog post:

Critics sometimes claim that encryption makes it impossible to subpoena or obtain a warrant for information from people’s phones — this is bizarre because governments already demand such data. What they are actually complaining about is that the “platform” — for instance Facebook — no longer wants to be able to see the content themselves. The warrant will have to be served upon the device owner, not upon the (social) network provider.

https://alecmuffett.com/article/15742