Can we integrate HTML file in Dynamics NAV 2016?

Hello guys

I have a blob file with .html extension. When entering a field value in NAV, it validates the CAL code written and should display the  .html message of blob file.

However I'm getting the .html message displayed but it is displaying the html tags which we've written and not with some UI designed message which we are expecting.

So is there any DOTNET .dll file which supports this feature, Is it possible to achieve in NAV?? Please suggest me.