Using a class for underline instead of <u> tag

[KevintHelius]

Hello, I wanted to know if there is any way for the underline plugin to add a class instead of using the tag: for example: <span style="underline"></span>

The tag is not recommended as stated in the mdn docs and my specific use-case needs for a custom class to be applied.

[KevintHelius]

I found a way by extending the plugin but it would be great if it was built in as an option

[CKEditorBot]

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