Call js script in html5 game

[Pawel]

I don’t know the exact answer to your question, so let’s wait for some other response, but in the other direction (from JS to Lua) I recollect this:

JsToDef - simple way to send messages from JS to Lua

[jstodef] JsToDef Native Extension that makes possible to send messages from JavaScript to Lua in HTML5 build. Setup You can use the JsToDef extension in your own project by adding this project as a Defold library dependency. Open your game.project file and in the dependencies field under project add: https://github.com/AGulev/jstodef/archive/master.zip Or point to the ZIP file of a specific release. API JavaScript side JsToDef.send(message_id, message) Where message_id is a string that…

You can check out if it is working and useful for you

EDIT:
For the other direction Defold has a HTML5 API, so for example you can use html5.run() in your Lua code responsible for in-game button handling, to run a chunk of html with script tags inside

You can check out more in this thread - it might have a ready answer for you:

Can I run js scripts?(SOLVED)

I have a script to get bpm on js, on defold I have not seen such plugins. Can I run a js script on defold?