You can use the file:// url prefix to do it, but it won't do what you think. Your R:// drive exists on your client machine - it'll work for you, and fail for all other users that don't happen to have exactly the same drive mapping.
hello,
Unfortunately it's seems not possible without add-on : https://confluence.atlassian.com/jirakb/can-t-link-to-local-files-from-within-jira-216958260.html
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