Rich Text Editor - External links should work with non-HTTP(S) URLs

Adding links to external pages in the issue's description or a comment with the rich text editor's built in function only works with certain URLs.

I could not find any settings or related issues so I decided to make a suggestion.

First scenario (positive)

Adding a link to "https://www.atlassian.com/" works fine. The rich text editor will show a clickable link.

Text mode:

[Atlassian|https://www.atlassian.com/]

Switching to visual mode:

Atlassian

Second scenario (negative)

Adding a link to e.g. "notes://SRV01007/412569AD002D0EB4/" does not work.

Text mode:

[Notes|notes://SRV01007/412569AD002D0EB4/]

Switching to visual mode:

[Notes|notes://SRV01007/412569AD002D0EB4/]

Conclusion

After some testing I found out that the external link feature seems to work only with URLs starting with "HTTP" or "HTTPS". Linking to Documents in external tools, such as our collaborative plattform / mail client IBM Notes, does not work. 

Copy / Paste seems to be the only (but not efficient) workaround and I would like to see this feature implemented, as Jira is a modern Web Application and adding links to a text is basic HTML.