As far as I can see it is possible to export to BeerXML. However an import function is still missing. For example this website provides all the Brewdog Diydog recipes as BeerXML:
https://brewdogrecipes.com/
Maybe a similar approach like the one with the json import is possible here, too. Simply convert BeerXML to xsud inmemory and use the sanity checks from the xsud import.
As far as I can see it is possible to export to BeerXML. However an import function is still missing. For example this website provides all the Brewdog Diydog recipes as BeerXML: https://brewdogrecipes.com/
https://en.wikipedia.org/wiki/BeerXML