To record to the DVD, connect the A/V cables from the JVC GR-D347U to the A/V In on the DVD recorder. Since the DVD already plays to the TV, you just have to keep the TV set to that input. Put a blank DVD in the recorder. Set the DVD recorder to record on from the appropriate Line In (input) with the DVD as the target recording media. To make sure that all of the devices are on and receiving the output from the camera and DVD recorder, start playback on the GR-D347U and check that it displays on the TV. Forward the tape in the camera to the point where you want to record to the DVD. Stop playback. Press REC for the DVD recorder and restart your playback. Press stop for both the DVD recorder and then the camera when the desired video segment has been played back.
See page 21 of the manual for the GR-D347U. Treat the DVD recorder as a VCR for this situation. The manual is available here: https://www.manualslib.com/manual/82266/Jvc-Gr-D347u.html?page=21#manual
I hope this helps. Please add a comment with the details of the DVD recorder for more information on connecting the unit in this daisy chain.
(Many recorders have at least two composite video Line In inputs. That's why you need select the correct one for recording.)