flutter api call + json model

Hey, i need help with a specific api post call to display the data i need. I can receive the json response and it looks good, but i need a data class model to work with this response. Its a nested json with a dynamic KEY . At the end, i need the SUM of one data variable out of this model -> to calculate the profit for all entries out of this model. Under "histroy trades" its the ticket ID and within it the data "profits". i need the total sum of all profits out of an api call example: { "status": true, "data": { "history_trades": { "2197653": { "ticket": 2197653, "cmd": 4, "open_time": 0, "close_time": 1656385204, "position_id": 0, "reason": 2, "profit": -60.776, "commission": 0, "swap": 0, "volume": 0, "open_price": 0, "close_price": 0, "symbol": "", "comment": "comPF 6600.67 20220627" }, "2193073": { "ticket": 2193073, "cmd": 1, "open_time": 0, "close_time": 1656344568, "position_id": 2045126, "reason": 2, "profit": 151.94, "commission": 0, "swap": 0, "volume": 1, "open_price": 0, "close_price": 1, "symbol": "PnL", "comment": "" }, "2215477": { "ticket": 2215477, "cmd": 4, "open_time": 0, "close_time": 1656558004, "position_id": 0, "reason": 2, "profit": -45.748000000000005, "commission": 0, "swap": 0, "volume": 0, "open_price": 0, "close_price": 0, "symbol": "", "comment": "comPF 6715.04 20220629" }, "2212003": { "ticket": 2212003, "cmd": 1, "open_time": 0, "close_time": 1656522173, "position_id": 2045126, "reason": 2, "profit": 114.37, "commission": 0, "swap": 0, "volume": 1, "open_price": 0, "close_price": 1, "symbol": "PnL", "comment": "" }, "2228644": { "ticket": 2228644, "cmd": 1, "open_time": 0, "close_time": 1656689387, "position_id": 2045126, "reason": 2, "profit": 62.33, "commission": 0, "swap": 0, "volume": 1, "open_price": 0, "close_price": 1, "symbol": "PnL", "comment": "" },

Project ID: 34205914