Any idea on how to export_enum an array of resources?

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You can use Object._validate_property() to modify programmatically how the property will behave in the inspector.

For example (assuming your ItemDB resource exports an array of strings):

@tool
class_name Inventory extends Resource


@export var items:Array


func _validate_property(property: Dictionary) -> void:
	if property.name == "items":
		# Load the item db
		var item_db = preload("res://item_db.tres")
		# Join the items array by comma
		var items = ",".join(item_db.items)
		# Create the hint string <type>/<hint>:<hint_string>
		property.hint_string = "%d/%d:%s" % [TYPE_INT, PROPERTY_HINT_ENUM, items]

Will show:

The values will be saved as an array of ints. In this case the indices of the entries of the ItemDB.items array.