I mentioned it in https://sourceware.org/pipermail/binutils/2021-February/115541.html , but a feature request is more explicit.
On LLVM land someone is proposing a JSON output format for llvm-symbolizer (similar to addr2line): https://reviews.llvm.org/D96883
This feature request is to bring awareness about cross project coordination:) If both projects want to add the feature, then having a compatible format will be nice.
(Personally I don't think JSON output format for llvm-symbolizer is necessary, but I would not get in their way if other reviewers want it.)
https://reviews.llvm.org/D96883 it may soon be accepted :)