Find position of Gateway from id

Hello,

I used a pycom Lopy4 module in a stratospheric balloon launched in France.
LoraWan transmissions (TTN and Objenious) have been successful all the way through various TTN gateways.
For very few gateways I retrieved the GPS position with MQTT and node-red.
The furthest points on the map are at about 500 km (Southampton / England eui-7276fffffe010292 and eui-7276fffffe01028c) when the balloon was 22 000m above sea level
Knowing the identifier of each gateway, how to find the GPS positions of the other gateways that received the UPLINK?
Which method do you recommend?
Thank you

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