Can you create lists, or do you have to make multiple variables?

Could you explain the question a little more?

GDevelop structures are a List. You can access it as a List, f.e. nameList[“key”]

Also, you can create dictionary file using Store options of GDevelop:

I créated file manager to créate dictionary file. Dowload link:

When you have finished to write key and value fields, press Save Data button, to save in memory.

When you write key field, you can press Load Data to view value field.

Finally, press Close File button, to save data in a file disk.