Are there plans to implement a to_data_frame() method for EpochsTFR and AverageTFR objects?

I would like to export/save the according data for further analysis in R.
I just recently learned about the to_data_frame() methods for Epoch and Evoked objects and find them terrifically useful. Would be great to get the same luxury for tfr data.

I'm also thankful for hints regarding major obstacles that speak against it or if there are already similar implementations that I'm not aware of.
Thanks!