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Aliexpress is full of this stuff: https://www.aliexpress.com/item/32974987089.html?spm=a2g0o.productlist.0.0.14e538709rYTOg&algo_pvid=84e59df6-98ad-4937-ad05-59d4f4bdadd1&algo_expid=84e59df6-98ad-4937-ad05-59d4f4bdadd1-0&btsid=2100bdd516132257829321205e51ac&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Heads up, none of the sram/avid hoses listed there are compatible with your Rival stuff.
Part number for what you need is 00.5318.011.001
It uses a specific banjo connection thats only compatible with Rival22, Force22, Red22 and s700.
I learned this the expensive time consuming way
I've never found any cheap solution to this yet, I ended up forking out for the proper sram branded hose
edit - in stock here https://www.amazon.co.uk/dp/B00DMIB6VY?linkCode=xm2&camp=2025&creative=165953&smid=A3P5ROKL5A1OLE&creativeASIN=B00DMIB6VY&tag=geizhals07-21
And you need a bleed kit and DOT5.1