Is it possible to include the underscore in the color scheme

On this site downloaded color scheme for Sublime Text, in which, for example, a class name must be underlined. But when choosing this theme in Sublime Text underlining, no. Tried to do it with multiple themes is not working. A Google search gave no results. Question: maybe someone knows how to include the underscore?

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Is it possible to include the underscore in the color scheme

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