For those who are finding the solution like me, Look up how to send pdf with mail merge You can send a mail with fields of your choice!
There's a catch though...
You can only send fields from selected modules I guess.
To fix this follow these instructions...
1) Create a Zoho flow action that every time you add or edit a new product, it pulls all its' data into a spreadsheet (can be google sheet)
2) Create a writer merge doc based on the product data spreadsheet (it will allow you to take any fields from that sheet and do a regular, custom mail merge you would do with anything else)
3) Create a Zoho flow that will use the writer template you created, and pull all relevant data from the module on create / edit. Once you connected the writer template to the data spreadsheet, actually, you do not really use the spreadsheet any more. It just enables you to add module's fields into the template.
4) add any other steps in Zoho flow to store the created writer docs in Zoho docs or do anything else with that template. I use to store them in Zoho docs and just download them from there when needed.
I feel Zoho Should've given this functionality long ago but they chose not to.
If I am missing something feel free to add your thoughts.