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Transforms are used by Bips to map and combine attributes between adjacent channels. They are a JSON object where the object keys are the named imports of a target channel, and the value is the data to inject, evaluated as a text template.
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eg: say we have an [email channel](https://bip.io/docs/pods/email) and we want to set two of its imports, `subject` and `body_text`. We can inject custom values like so :
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eg: say we have an [email.smtp_forward channel](https://bip.io/docs/pods/email) and we want to set two of its imports, `subject` and `body_text`. We can inject custom values like so :
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```
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{
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| ... | ... | |
