SIMPLE: Help adding chamber temp sensor!

So noob question,
I’m wanting to add two thermistors to use get enclosure temps at the the top and bottom of my VC3.1 500mm.

Do I need to define pin aliases for these two?
I tried inputting both TH1 & J46 but they error out saying the pin isn’t valid.

Board: BTT Octopus Pro H723 V1.1
Pins: I think are as follows:
TH1 / J46 Top Enclosure
TH2 / J47 Bottom

Printer.cfg
(Bottom sensor not added to confit yet)

[temperature_sensor chamber]
sensor_type: EPCOS 100K B57560G104F
sensor_pin: J46
min_temp: 0
max_temp: 125
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