How can I extend my Payload to have multiple objects in one call?

I’ve currently got a JSON Payload designed for an OData API as follows: { “testData”:“testData” }

Wherein the above payload consists of one object that will be inserted into a table. However, right now I need to do a form of testing in which I have to send multiple objects in one call, AKA my call should look something like this:

{“testData”: “testData1”},
{“testData”: “testData2”},
{“testData”: “testData3”},
{“testData”: “testData4”}

Is there any way I could achieve this? I’ve currently tried modifying my Payload in Postman but I’ve been unsuccessful thus far and I am at my wits end.