A plugin is avalable Here Download the files from github and place into the plugins directory and reload plugins. You will need to install python, and using pip install requests and stashapp-tools. The plugin has an on update trigger as well as a task to submit timestamps and fetch timestamps.
Once you have downloaded one of the above import this into xbvr by going to downloads > Data export / import.
It is recommended to just import cue points and optionally overwrite existing data.