RE: Trigger Power Automate Flow on change of field
                     
                    
                      
                        Hi Kalp Shaha,
Create power automate using trigger 'When an HTTP request is received'

and on change of your column write similar code.
        var flowUrl = "flow URL";
        var input = JSON.stringify({//If you any parameters defined in your power automate than used line number 4 to 7, otherwise remove it. 
            "argument 1",
            "argument 2"
        });
        var req = new XMLHttpRequest();
        req.open("POST", flowUrl, true);
        req.setRequestHeader('Content-Type', 'application/json');
        req.send(input);//input is passed when you need it. 

Let me know if I can provide more details.
Thanks
Regards,
Abdul Wahab
Power Platform/Customer Engagement Developer/Lead/Solution Architecture/Project Manager
Direct/WhatsApp: 923323281237
E-mail: abdulwahabubit@outlook.com
Skype: abdul.wahabubit