[SDF-96364] How to add variable in Reply Template?

[SDF-96364] How to add variable in Reply Template?

Im trying to set Reply Template to have import serial number from Asset
Description is I can use a variable:
Type $ in the editor to select and insert a variable

So im find $CIName to insert a Name of this Asset and this works adding in reply Name of asset from request.
But how can I find variable to insert SerialNumber from this Asset. Is there something as $CISerialNumber or other variable?

Please Help
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