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It depends.. Is the s3 bucket also being managed by Pulumi? What does the code look like?

The S3 bucket is managed by another pulumi stack. What part of the code do you need ? Here's how I create the layer:

# Create Lambda Layer
layer = lambda_.LayerVersion(
    resource_name="mylayer",
    layer_name="mylayer",
    compatible_runtimes=["python3.8"],
    description="Layer containing the dependencies for Lambda",
    s3_bucket=my_bucket_id,
    s3_key=f"{artifacts_path}/lambdalayer.zip",
)