PLEASE HELP JSON conditional formatting in SharePoint Online

I am trying to us column formatting in SharePoint Online and am very new to JSON.  I am trying to use conditional formatting based on another column.  This was the code I was using when we could do calculated columns.

I would really appreciate anyones help getting me started on how to do this.

=IF(CAI=”Green”,”<img src=’../SiteAssets/Green.png’ border=’0'/><div style=’font-size: 75%;color: white; position:relative; text-align:center; width: 88px;top:-33px;word-wrap: break-word;’>”&[CAI Vendors]&”</div>”,IF(CAI=”Yellow”,”<img src=’../SiteAssets/Yellow.png’ border=’0'/><div style=’font-size: 75%;color: black; position:relative; text-align:center; width: 88px;top:-33px;word-wrap: break-word;’>”&[CAI Vendors]&”</div>”,IF(CAI=”Red”,”<img src=’..../SiteAssets/Red.png’ border=’0'/><div style=’font-size: 75%;color: white; position:relative; text-align:center; width: 88px;top:-33px;word-wrap: break-word;’>”&[CAI Vendors]&”</div>”,””)))