How to create a custom shortcut on Slack?

I’d like to be able to use a character to stand-in for typing a long URL in Slack.

Instead of

https://www.thisiswaytoolongtotypeeachtime.com/ID/123456

I’d like to be able to do

^123456

or an equivalent with a constant prefix and have Slack know to convert my input to the full URL.

My root URL doesn’t change, just the item ID.

Does this functionality exist?