Problem with the VTOY_DEFAULT_IMAGE parameter

[crasadure]

Your default image path is wrong
     { "VTOY_DEFAULT_IMAGE": "/ventoy/Macrium/MacriumReflect_Home_8.1.7336_Rescue_WinPE10.iso" }

You should write iso path like that:
     { "VTOY_DEFAULT_IMAGE": "/Macrium/MacriumReflect_Home_8.1.7336_Rescue_WinPE10.iso" }