How to manually configure the Link module included in drupal core?

I would like to be able to add the file:// protocol to the list of filter_protocols so that we can add links to shared company files on a mapped drive from within our intranet website, but I’m not sure how to do this. Right now, it is apparently not included, according to Link Module Overview. Is there a way to manually configure this list in order to add file://?

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