Index a sitemap without robots.txt

Hello!
I am using YaCy as an search engine for a few of my sites. Sadly, the “From Sitemap” field is disabled, unless a robots.txt with the Sitemap: attribute exists.
Is there a way to remove that check for the robots.txt and be able to type in a sitemap.xml without it?
Thanks!
BW Tin

Works fine by just removing the disabled=“” html tag from the option. lol