So can we somehow add 2TB

… at least M.2 SATA, for less power consumption?
Does anyone have any successful experience?

Yep, it works fine. The secret is to use slower M.2 storage. Anything faster than about 2600 failed for me. But when I used a slower SSD, it worked. Something to do with a BIOS upgrade needed to support faster M.2 storage. This one worked for me:

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I found a discrepancy in the consumption parameters. Can you be more specific about what is listed on your SSD?

Sorry, I can’t. The computer is in Mexico at our 2nd property and I’m in Arizona for the next few weeks. I can’t open it to tell you that. Good luck.