[WIP][Form] Improve transformation failure message by providing property path

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   |
| Fixed tickets | #11287
| License       | MIT
| Doc PR        |
this is a reverse transform now, I guess we could say "reverse" here :)