Create autopost with hyperlink through plugin

Hi,

I have a requirement to create auto post with username hyperlink. I need to do it through plugin not OOB workflow.

I could create a post as below

Entity objPost=new Entity("post");

objPost["text"]="some text";

objPost["regardingobjectid"]=new EntityReference("contact",id);

objPost["source"]=new OptionSetValue(1);

service.Create(objPost);

But in text field I should need to show Loggedin username with hyperlink to user record. When I click on the username it should open the user record.

Is it possible to do the hyperlinks in text field from plugin?

Thanks

Bala