There are many. I've seen many post on freelancing platforms who are looking for legal writers. As what I understood, there are web sites or online law firms who are offering legal advice and other services that hires lawyers to address their clients/visitors' legal concerns.
Furthermore, the transcriptionist field is always open for them be the audio files to be transcribed is legal in nature or not as lawyers are normally have an excellent grasp of English grammar and vocabulary. The legal subject I believed has a higher rate.
Lastly,they could also offer translation services especially in legal subjects.
With these vast opportunities and proper time management, they could earn much more in freelancing and might realize that online career is more lucrative than the tense and taxing career offered by physical law firms.