I have measured AEMLION battery charge current using three different solar panels in indoor light (500 lux), outdoors in the shadow, and in full sun (~500W/m^2). 

Indoors (~500 lux) and with the smallest solar cell the battery is charged at 50uA for 10 hours. Then the application must have an average current of (50uA*10hrs/24hrs) 20uA or less. That's enough for a simple Bluetooth Low Energy beacon or a very simple LoRa application. If that is not enough you need to select a larger solar panel. 

Outdoors in shadow current is 10-20 times larger. And in sun 100 times larger. 

As you can see the AEM10941 can charge a battery from indoor light but indoor light is really only suitable for very low power applications.