Specifying font fallback order in the text overflow check

The purpose of requested feature is to be able to run the text overflow check with the same font fallback order as the target device environment.

Scenario
There is a situation where a string contains some characters that are not supported by the font and the missing characters would use another font. This fallback order depends on a target environment. It'd be nice to create the same fallback order in the test environment and do the text overflow check.