That doesn't really make sense as asked. A String is just text. It doesn't contain any information about how that text should be displayed unless it is interpreted as markup, e.g. RTF or HTML. You can instruct a Label how to display the text as a whole, e.g. by specifying a font or colour, but variable formatting takes something more.
The Label does have a Content property but then you'd need to assign something to that that could do the variable formatting. There's certainly no standard control that will allow you to load plain text 和 easily specify how it gets formatted. The RichTextBox does it by loading RTF markup 和 interpreting that. Another option that is still not the simple magic solution you want but might be easier than RTF is to use some sort of web browser control 和 use HTML markup to format. That's a bit more human-readable than RTF 和 web browsers are read-only by default.