Anyway to construct a UMG UI blueprint by code ?

I am going to migrate my game from other engine to ue4-27. Hundreds of UI also need to migrate, is it possible to write a plugin or some scripts to convert them automatically? (not logic,only UI layout) I know some engines’ UI has structure file(like json), users are able to write files to construct UI. I cannot find a similar way in unreal(UI asset files are binary).