Hi @Gonzalo this is pretty experimental feature. But yes to implement it you would add an extension like

"extension": [
    {
      "url": "https://medplum.com/fhir/StructureDefinition/pre-commit-bot",
      "valueBoolean": true
    }
  ]

Then at the server level, you would set

preCommitSubscriptionsEnabled

to

true

and then at the project level you need to set

preCommitSubscriptionsEnabled

to

true

as well.