Can i set two fonts in a textbox?

[RunMonkey]

I have an application scenario where I can input some special characters. I must load the special character font (there are only special characters here). These characters are not in normal fonts,

I set FontFamily = "Arial, specialfont" to display normal characters but not special characters;

Set FontFamily = "specialfont, Arial" to display special characters, but normal characters cannot be displayed.

In WPF, setting FontFamily = "Arial, specialfont" can all display normally. Can it be supported in Avalonia? Is there any way to achieve it?

[Gillibald]

The TextBox currently doesn't support font fallback this feature will be added in january
Duplicate of: #4708