Render LUFS (Pre-release version for VIP members) is a script that helps automatically rendering a file to the desired target integrated loudness (LUFS)
Define parameter of the plugin (normally a limiter threshold or gain plugin) that you want the script to adjust for obtaining louder or quieter final file.
Open render settings and define the output. Activate "Add rendered items to new tracks in project", so this way, the script can analyze the loudness after rendering.
If the loudness doesn't match the desired target, then it adjusts the plugin's parameter and renders again to have a final render file with the desired loudness.