Your iconography should support Bold Text too. One way of doing it is by creating custom symbols (and specifying weights for it) to work with them as you would with regular SF Symbols.
How Creating custom symbols: https://developer.apple.com/videos/play/wwdc2021/10250/
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In iOS' Settings you can specify your preference to use bold text. This can be checked in code in a couple ways: 1. isBoldTextEnabled in UIAccessibility: https://developer.apple.com/documentation/uikit/uiaccessibility/isboldtextenabled 2. legibilityWeight from UITraitCollection: https://developer.apple.com/documentation/uikit/uitraitcollection/legibilityweight
Manual testing is crucial. And therefore, reducing friction to let you start your testing process can be a huge help. Selecting some accessibility shortcuts will do that, putting most of iOS' accessibility features at a triple-click of a button.
You should convey important information in multiple modes, not just color. If you are still required to do so, at the very least you should complement that info with other modes, like symbols, if the user requested differentiation without color.
