See Step.34 of the ifixit Sostituzione scheda madre Google Pixel 4a guide to find the location of one end of the WiFi/BT antenna. You will have to search for the other end of the cable, as it is not shown in the guide to make sure that it is totally disconnected
Note, disconnecting the antenna will not prevent WiFi/BT connection but will limit the effective range to <30cm, so the phone would have to be used nearly right on top of a WiFi router for it to connect.
Also turn off the WiFi setting
Removing the WiFi/BT IC from the systemboard may not be advisable as at least then it will be easy in the future if you need to restore the phone to full functionality by simply replacing the antenna.
Disconnecting this antenna will not affect the GSM signalling function in the phone.
You can turn off the data function by going to Settings > Network and Internet > data saver.
To ensure that no one else can turn the WiFi or the data saver on again etc, use a pin number that only you know to open the phone and also create/connect a Google account for the phone. The Google account means that the user ID and password would need to be known to access the phone if a factory restore was attempted in the case of the phone being stolen/lost or someone else simply trying to access it etc
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