Yes, please provide a source! Based on this [0], with the High-Gain antenna (Ka-band), they can do 3.5 Mbyte/sec (28 Mbit/sec), which is about 295 Gbyte/day. Even if only assuming 16 hours/downlink/day, that is ~200 Gbytes/day. Also, with the S-Band Medium gain antenna, JWST is capable of accomplishing true duplex communication, which means they can uplink on the S-band and simultaneously downlink on Ka-band.
For reference, MRO is capable of downlinking at up to 5 Gbit/sec with a 3.0-meter HGA [1].
For reference, MRO is capable of downlinking at up to 5 Gbit/sec with a 3.0-meter HGA [1].
[0] https://jwst-docs.stsci.edu/jwst-observatory-hardware/jwst-s... [1] https://descanso.jpl.nasa.gov/DPSummary/MRO_092106.pdf, table 4-7