Welcome @edenprojectde!
Would this help:
I did a quick test with config like this:
{
"editor": {
"relative_urls": false,
"remove_script_host": false,
"document_base_url": "http://www.site.com/path1/"
}
}
and it worked as expected when used with relative urls (i.e. setting myImage.png
ended up as http://www.site.com/path1/myImage.png
).