Not an answer - but another question - did you manage to solve this, we're looking for the same solution?
@SaJaL RaJ not directly but if you format the subject line in a particular way you can use API automation to set a custom field value:
https://developers.trello.com/docs/getting-started-custom-fields
For example, when you send an email in the format:
New expense $3.20
you could split the title of the created card at the $ sign then enter 3.20 into the Amount custom field.
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