Hi @Felix_is_stuck, this sounds like quite a challenge to build yourself without a designated node. Luckily, this problem has already been solved, for example here:
You could for example use such parser code in a Function node. Here is an example using the above parser and then reading the full name (which just takes the first value from the FN field) as well as the home address (which performs a bit of filtering for demo purposes):
Example Workflow
Hope this helps! Let me know if you run into any trouble here.