We’ve mentioned that Live Component authoring might be available some time in 2021. Typically, a launch like this entails smaller private “alpha tests” followed by a larger private “beta test” before a public launch.
If you are interested in testing and authoring Live Components please fill out our Live Components Author’s form. We’ll reach out over the course of 2021 as we release authoring features which might be a good fit for your use case. Thanks for your interest.