Hello,
I recently made this tool that I'd like to share.
If you don't have a paid Oura Ring membership your unable to access the API therefore adding your sleep and HRV data into Runalyze is difficult and requires you to manually download the JSON data and enter it into Runalyze.
I've created a script that allows you to drag and drop the JSON file into a window and it'll automatically get the sleep and HRV values for the most recent day and make a POST request to Runalyze.
You can check it out at the github repo here. https://github.com/jamesbrown173/oura-json-export-to-runalyze
Hope this is useful.
J