There looks to be a way to do it alright as I see a post about cisco active advisor supporting it , haven't used it though but moving from IOS to IOS-XE there is very little difference , the majority of your commands should work fine or its quite easy to find the new relevant IOS-XE command , only routers supported on the advisor though not 6506s are you having an issue with certain syntax ?
https://help.ciscoactiveadvisor.com/support/solutions/articles/5000558974-how-do-i-view-converted-ios-xe-configurations-for-my-ios-devices-