What a great blog, this has been the most helpful post I've read over Azure Resource Graph. You are right, tons of info but I'm always challenged on getting the data I need.
Appreciate your insight and looking forward to reviewing your Github.
I was able to create this query using your help.
*Note - I have added extra Project fields just to help review the columns:
resources
| where type =~ "microsoft.storage/storageaccounts"
| extend networkaccess = properties.networkAcls.virtualNetworkRules
| mv-expand rules = properties.networkAcls.resourceAccessRules
| extend rules1 = rules.resourceId
| extend rules2 = split(rules1,'/')
| extend resourceId = rules2[-3]
| where networkaccess != "[]" and rules != ""
| project name, networkaccess, rules, rules1, rules2, resourceId
| limit 10