You should first check if jEdit supports that language,
http://www.lextm.com/2012/01/tritonmate-words-syntax-highlighting-for-smimib/https://docs.lextudio.com/blog/tritonmate-words-syntax-highlighting-for-smi-mib-efe99ad93af2
If jEdit supports it, you can easily convert the jEdit grammar file to the style SharpDevelop TextEditor expects.
If there is none in jEdit, it is not too hard to write your own according to
https://github.com/icsharpcode/SharpDevelop/wiki/Syntax-highlighting