I am creating sitemaps using Google Search Console and we are exploring an option of creating txt sitemaps. There are many sitemaps so using a sitemaps index file is basically a requirement but I didn't find the way of doing that in the sitemap protocol and Google SCH.
I tried building txt sitemaps index file akin to the txt sitemaps:
but Google SC treats this file as a sitemap and doesn't detect the linked sitemap file and its urls.
Is it possible to create txt sitemaps index file?