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I can't find references to JPEG 2000 on this report: https://link.springer.com/article/10.1007/s11214-020-00765-9

Are they being re-encoded into regular JPG files when being shown online?

You're right. They're encoding just regular JPEG for lossy compression. They're also using either ICER and LOCO for lossless compression. JP2 has been used for other Mars spacecraft (the HiRise orbiter, I believe), but the JPEG encoding was inherited from the Mars Insight lander (in 2018).

Look for “JP2”. It is used for other spacecraft that are part of the Mars fleet.

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