iPad Air 4th generation Wi-Fi
Can an iPad 4th generation Wi-Fi only be upgraded later to a Wi-Fi + Cellular by the addition of an eSIM chip, slot, card ot other means?
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It is not possible to change or modify the internal hardware components of an iPad.
A WiFi Only iPad cannot be transformed into a WiFi+Cellular model. You can, however, use the hotspot feature of a mobile phone - or a Cellular Broadband Router (often known as a MiFi Router) - to access Cellular networks.
How to set up a Personal Hotspot on your iPhone or iPad – Apple Support