I don’t know about “code tags”, I put the files you asked for in *.TXT files but text files aren’t on the “approved for upload” list.
Sorry I don’t use Arduino IDE any longer, outgrew it ( - 
So coach me some more and we can get there.
Assuming you can use the program I’ve already submitted here is the PLATFORM.INI file:
; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; Redirecting...
[env:seeed_xiao_esp32c3]
platform = espressif32
board = seeed_xiao_esp32c3
framework = arduino
lib_deps = adafruit/Adafruit MCP9600 Library@^2.0.2