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Shimano bluetooth adapter + smartphone + STunlocker app would likely give you a percentage readout, not sure if the bluetooth connection would remain live the whole ride or if you'd have to reconnect each time you want battery data

or two commencal meta power 29's for the price of one of those

i just rode a rental size 4 Levo SL from downieville up to packer saddle, up gold valley rim trail & back down to town via pauley creek. it climbs great, plenty of power given how light it is, fantastic range, but imo as a potential alpine climb + descent bike it's overall horrible as the descents aren't even worth the climb: the 2 pot sram brakes are horrible, require far too much constant finger pressure compared to a good 4-pot brake to keep your speed in check so you don't obliterate the rims & tires, the 34mm fork is...

the steps display is a terrible option, battery level readout is 5 bars ie not even to 1 significant figure. you have 2 bars left: does that mean 40% or 21%?? big difference. garmin readout is 2 significant figures e.g. 31%.. here are the exact garmins which will read EP8 battery level: https://support.garmin.com/en-US/?faq=q4RSx3lPFL8dWJ9lk12Kk9