Hi ,
I believe Infraworks is being explored for a potential plugin by the Datasmith team, although I don't have any additional information to share beyond that.
For Bentley ConceptStation, I don't believe any plugins are being developed internally, but Bentley had developed and maintained their own Datasmith plugin for ITwin to Unreal Engine. I'm not familiar with the functionality of this, and whether it will work well with Twinmotion, but it is possible Bentley may develop a plugin themselves given the demand.
For any plugins you'd like to see the Datasmith team deliver, please submit an idea on the public roadmap here, as that's the best place to make requests of this kind.
Best,
Raghib