A few days ago there was an intense discussion in LiteSpeed Slack about why you can only enter 1 sitemap for the crawler in the cache plugin for WordPress. If you have a plugin installed, such as YOAST or Rank Math, the question does not arise because these plugins automatically create an index sitemap. However, a LiteSpeed user pointed out that if you use multiple languages in WP, it would be bad if you only give 1 sitemap to Google. It would probably be better if you used a separate sitemap for each language. However, you then have the problem with the build-in crawler in the LSCWP plugin. To solve the problem I developed a sitemap combiner that combines up to 10 sitemaps. The demo and the download of the application are available at:
https://www.xml.cachecrawler.com/kitt/
https://www.xml.cachecrawler.com/kitt/