The following lua code does the trick - it captures Jupyter's html tables 
and converts them to latex tables for rendering in PDF.

function RawBlock (raw)
    if raw.format:match 'html' then 
        return pandoc.read(raw.text, 'html').blocks 
    end 
end

New problem exposed, though.  Nested tables are not converted properly.  
I'll treat this conversation re: adjusting for html code as resolved, and 
I'll open a new conversation re: converting nested tables.
On Monday, July 18, 2022 at 6:40:36 PM UTC-7 Richard Huntsinger wrote:

> Thank you much, fiddlosopher, for your quick reply.  Clearly, I need make 
> use of lua filters to adjust for the HTML code in my Jupyter notebooks.  
> I've now read the lua documentation and tried some of the examples on the 
> pandoc doc site and pandoc/lua-filters repository - but I don't see an 
> example of how to search for and transform HTML-format tables to native 
> pandoc-format tables, or similar such thing.  Can you provide me some 
> additional guidance?   
>
> On Monday, July 18, 2022 at 12:54:17 AM UTC-7 fiddlosopher wrote:
>
>> Raw HTML in a Markdown document (which is apparently what the R 
>> display_html function produces) will not be passed through to PDF. 
>> Similarly, raw LaTeX will not be passed through to HTML.
>>
>> One approach might be to generate *both* formats in your notebook. You 
>> could try that.
>>
>> Another approach would be to use a Lua filter that matches raw HTML 
>> blocks and uses pandoc.read to convert them to native pandoc tables, which 
>> could then be rendered in PDF. I believe there are examples of such filters 
>> either in the Lua filters documentation, or in the pandoc/lua-filters 
>> repository, or on this list. If you can't see how to do it, just ask.
>>
>>
>>

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