I can’t tell you how to do this in twig/timber. There have been a few questions here about this template system, and they get few responses. The best that I can give you is a link to the developer’s “How To” on sorting repeater fields https://www.advancedcustomfields.com/resources/how-to-sorting-a-repeater-field/
You can find other examples on the web that cover it, but like I said, I can’t tell you how you’d do this inside of your template. You would need to build a custom acf/load_value filter in PHP.
