What to use to teach the web to html code completion

Hi, I’m trying to find a way by which I will be able to teach the network to complete html code with TYPO3 fluid tags.
I used over-trained gpt-neo for this but it works 50/50.
Here code html with fluid tags: bootstrap_package/MainNavigation.html at master · benjaminkott/bootstrap_package · GitHub

Did anyone have a problem similar to the relationship?