I use the Excel library in Flutter Project, there are formatting template classes(NumFormat), but there is no currency formatting to display the ruble or dollar sign.
The library makes it possible to create your own value format, but it is not clear where and how to use it, because when you try to write your own format and insert it into the CellStyle, the entire Excel file and its styles break.

I use the Excel library in Flutter Project, there are formatting template classes(NumFormat), but there is no currency formatting to display the ruble or dollar sign.
The library makes it possible to create your own value format, but it is not clear where and how to use it, because when you try to write your own format and insert it into the CellStyle, the entire Excel file and its styles break.