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> I assume that I have to set _ENV for each chunk that possibly runs
> during template rendering (it can be many, and the idea is to call
> them repeatedly using different data tables). So this would mean to
> fixup _ENV for each chunk everytime the render() function is called?

When you convert templates to Lua code, add this line at the top of each script:
	local _ENV = ...

(That's three dots as in varargs.)
Then you can run each script passing a suitable table as its env at run time.