Information is wealth
Found a thread here from last year . https://www.reddit.com/r/Chennai/comments/18g9z5r/lets_make_this_template_real_drop_your_fav/
One comment from this link lead me into this site https://mycitychennai.com/a-database-of-everything-you-need-to-know-about-kovil-prasadam-in-chennai-the-when-the-where-the-what/ but unfortunately the page was no longer available , thanks to wayback machine was able to retrieve some info from comments .
I have compiled most of the resources here with edit access ,please update any info that you get or know: https://docs.google.com/spreadsheets/d/1KHCbrU_c4VcNQn0BdJ4T8eiSF64iRIb692y5SBw-Rbo/edit?usp=sharing .
For now you can enter your latitude and longitude in this link and find the top 10 closest space and other info by hovering over it . https://public.tableau.com/views/InformationisWealth-PrasadamsofChennaianoverview/Dashboard1?:language=en-US&:sid=&:redirect=auth&:display_count=n&:origin=viz_share_link