Importing to Bing Ads through Google Adwords should include Responsive Search Ads
Bing Ads should have the Responsive Search ads as soon as possible.
Thank you for your feedback. We now offer this functionality. To learn more about RSA, please visit our blog at https://about.ads.microsoft.com/en-us/blog/post/january-2020/save-time-and-increase-ad-engagement-with-responsive-search-ads