IAM role attached Policy update

Hi Community

I think everyone be aware of that cloudwatchfullaccess change to cloudwatchfullaccessv2. In my working environment i have so many roles with cloudwatchfullaccess policy attached. i just wanted to know how we can add that new policy to every role in my aws environment? if anyone know how we can get the roles that has cloudwatchfullaccess policy attached with aws cli command is veryhelpfull. Thanks team