today i had some capacities to give it a try. because there is a viewScript node, i discovered there is also a viewStyle node. And both are working similar. They both load the assets only if the block i actually used. But viewStyle loads the file as inline-css in the <body>. So this seems finally solved for me.
my old code:
"style": ["file:./assets/tabgroup.css","tabgroup"],
"script": ["file:./assets/tabgroup.js","tabgroup"],
recent working code:
"viewStyle": ["file:./assets/tabgroup.css","tabgroup"],
"viewScript": ["file:./assets/tabgroup.js","tabgroup"],
