Hi,
From what I know, such charging adapter conversion cable is not a product released by Microsoft, and Microsoft no longer officially sells charging cables for Surface Pro 1/2 (Model 1536). You could buy those from third party platforms, though quality may vary.
For an official recommendation you might want to contact Microsoft at https://support.microsoft.com/en-us/home/contact?SourceApp=surfaceweb1. Most people on this forum are not Microsoft employees and can't speak for Microsoft.
Thanks!