Access multiple images in custom script?

Yes, we call this “multi-temporal processing”. Find some info here:

Multi-temporal Processing

More than a year ago we’ve launched our real-time satellite imagery processing service that opened completely new ways of Sentinel-2…

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Some examples here:

custom-scripts/sentinel-2/max_ndvi at master · sentinel-hub/custom-scripts

master/sentinel-2/max_ndvi

A repository of custom scripts to be used with Sentinel Hub

custom-scripts/sentinel-2/cloudless_mosaic at master ·...

master/sentinel-2/cloudless_mosaic

A repository of custom scripts to be used with Sentinel Hub - custom-scripts/sentinel-2/cloudless_mosaic at master · sentinel-hub/custom-scripts

https://shforum.sinergise.com/t/temporal-analysis-burned-area/83

Note that you need to set TEMPORAL=true to the request when running multi-temporal (you can configure this in Configuration utility as well, among Advanced layer parameters)