I might be weird, but I find gron invaluable for figuring out what I need to pass to jq.
gron log.json | grep https
# see a json.log.entries[334].request.url
jq -r '.log.entries[] | .request.url' log.json
Exactly what I use gron for and my feature request would be to be able to do this from jless with one key. Currently it seems like jless doesn't even allow to select and copy it (on MacOS' terminal app).