[Question] Get borrower_info of previous block heights

[fentas]

Hello, not sure if this is the right place for this question.
I am trying to get borrowed amount of previous block heights to calculate the occurred loan fees over time.

WIthout previous knowledge, I just was trying within dev tools to change the request as follows but it always returns the current block height. Ideas?

height=5971055;
address="terra...";
(await (await fetch("https://mantle.terra.dev/?borrow--borrower", {
  "headers": {
    "accept": "application/json",
    "content-type": "application/json"
  },
  "referrer": "https://app.anchorprotocol.com/",
  "referrerPolicy": "strict-origin-when-cross-origin",
  "body": "{\"query\":\"{\\n  marketBorrowerInfo: WasmContractsContractAddressStore(\\n    ContractAddress: \\\"terra1sepfj7s0aeg5967uxnfk4thzlerrsktkpelm5s\\\"\\n    QueryMsg: \\\"{\\\\\\\"borrower_info\\\\\\\":{\\\\\\\"borrower\\\\\\\":\\\\\\\""+address+"\\\\\\\",\\\\\\\"block_height\\\\\\\":"+height+"}}\\\"\\n  ) {\\n    Result\\n    Height\\n  }\\n}\\n\",\"variables\":{}}",
  "method": "POST",
  "mode": "cors",
  "credentials": "omit"
})).json()).data.marketBorrowerInfo

[fentas]

So, it seems that block_height is arbitrary.
and other implementations just specify any block_height.
e.g. unl1k3ly/AnchorHODL#15

So is that a bug? Is there any way to find the loan_amount at any given time?