That is exactly what I was envisioning, building on the existing structure and workflow you have for adding stars and planetary bodies. Something like this:
1. Double-click on a planet name you've entered in the list
2. New window opens with a (+) icon for each node type (Mesosiderite, Metallic Meteorite, etc) - should include an "Uncategorized" option
3. Clicking the (+) exposes a new element with an icon for each mat (Germanium, Sulphur, etc), perhaps a circle (color coded by rarity, VC / C / R / VR) with the letters for the chemical abbreviation to keep with the current design theme
4. Each click on an element's icon increments the count of how many of that mat dropped, again in keeping with current workflow
5. Players who don't want to fuss with breaking them down by node type can simply add everything to "Uncategorized"
There is indeed.
https://forums.frontier.co.uk/showthread.php?t=207098