Setting Fallback Fonts in FontFamily Styling is Not Supported

Description

There is an issue already for this bug #25798, but for some reason it has been closed even though it's not fixed yet. This issue should not be closed even if there is inactivity. It is a bug obviously.

This is a critical bug especially if there are multi-languages in the app, let's say an app with both Hebrew and Latin texts. For the Hebrew text you use "HebrewFont" and for Latin text you use "LatinFont", so you should be able to set the fontFamily to "HebrewFont, LatinFont"

Steps to reproduce

This line of code works fine:
<Text style={{ fontFamily: "sans-serif" }}>Hello</Text>
This line of code works fine too:
<Text style={{ fontFamily: "Roboto" }}>Hello</Text>
But this doesn't work:
<Text style={{ fontFamily: "Roboto, sans-serif" }}>Hello</Text>

React Native Version

0.76.2

Affected Platforms

Runtime - Android, Runtime - iOS

Output of npx react-native info

Any React Native Project!

Stacktrace or Logs

There are no logs related to this issue

Reproducer

Any React Native Project!

从 issue 中的最小 React Native 复现开始，并在 Android 和 iOS 上将现有的单字体案例与 fontFamily: "Roboto, sans-serif" 进行比较。完成的标准是：逗号分隔的备用字体可在两个受影响的平台上用于多语言文本，并且已覆盖报告中的行为。