(Android Mozilla app) I am trying to add a custom search engine to Focus..

I am trying to add a custom search engine of my choice for maximum efficiency, speed/privacy, etc, autonomy, preferably SwissCows.. it is a secure site to my knowledge and all references lead to it having been secure, have searched it multiple times, no problem whatsoever, however browser is having some problems with detection when I input it in settings. If any staff onboard your teams could assist, I have not yet gotten this chance to take a screenshot, but I can also do that in a soonest reply I can.. I have been using the link provided on site for the search engine of Swiss Cows (as I said it's not as well known of a site, but it's a very secure one and smaller Swiss based focused company.. and even as well as, https, privacy focused, so yeah I guess.. maybe,, focus may not detect such types of search engine format in addresses alone quite yet. For your ease of use to save you time, below is that private search engine I mentioned. https://swisscows.com/en Thank you for your help. Hope we can solve this!