Bulk upload / import in Firebase with automatically generated keys

Question

I need to load massive rows of data using Firebase's "Import JSON" utility. But I was not able to include automatic generated keys, such as -Kop90 ... for each line. But instead, he created 0.1 .. keys.

This is my sample data.

[
{"date":1448323200,"description":"test data1","amount":1273},
{"date":1448323200,"description":"25mm pipes","amount":2662}
]

I would like to create something like this