Can't add attributes to `ReactInitJavaScript` script tag

We'd like to be able to add extra attributes to the `ReactInitJavaScript` tag:

_Current output:_
`<script>ReactStuff()</script>`

_Possible desired output:_
`<script nonce="Fo0/B4r">ReactStuff()</script>`

If it's a simple case of adding another parameter to the helper, and adding more to the TagBuilder, I'm happy to take a stab at this.
