There are multiple ways but i think all need an addon/plugin.
The Addon Jira Suite Utilities (Suite Utilites for Jira) offers a postfunction to set the value of a field in postfunction of transition.
With custom groovy script for the ScriptRunner plugin you could write a more complex behavior how to set the estimation or simply set the fixed to a value.
You would use both in postfunction of the create transition.
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