I wouldn't anticipate too much from m5stack. They have a habit of developing products that are well designed from a physical standpoint... but when you try to develop with them one finds that the software and support needed to achieve your goals are half-baked and downright annoying. UIFlow1/2, I'm looking at you...
For reference, see the M5dinmeter
You can just use freeink.org to develop for it fwiw