Injecting Node.js into static HTML

[littera]

I'm currently looking for a way to make node.js-API-calls from static html. I've looked at Express and similar template engines, however they would require me to write my html and generate it from their template engines instead of the other way around. I often get production ready HTML from designers and don't want to rewrite that to fit with express. Alternatively is there a converter from existing .html to template engines?To get a bit more basic, I want to use node.js in a similar way to ajax, basically being able to call things like \[code\]<img onClick="someNodeFunctionWithDatabaseCalls()">\[/code\] from an html-file running on node as a server and then manipulate the .html-file with DOM or something like that. Is there a way to do that?