There's a proposal for a large constellation of small, cheap-to-build radio sats. Heard about it on a Fraser Cain podcast. They plan to send them to one of the Lagrange points and spread them out in x KM cube pattern. They also want some of the sats to do some RF processing on-site, and beam just the "results" back.

These aren't telescopes, but it is quite similar to what you're describing otherwise:

https://research.google/blog/exploring-a-space-based-scalabl...