[In Troposphere] Is it possible to update the existing s3 bucket with Life Cycle policy to expire docs (in the bucket) after 30 days

template.add_description("blah ...")

s3bucket = template.add_resource(Bucket(
"S3Bucket",

BucketName="my-test-bucket",

# Attach a LifeCycle Configuration

LifecycleConfiguration=LifecycleConfiguration(Rules=[
# Add a rule to
LifecycleRule(
# Rule attributes
Id="S3BucketRuleFor90daysExpiry",
Prefix="/myindex",
Status="Enabled",
# Applies to current objects
ExpirationInDays=30
),
]),

))

This seems to get complaint around S3 bucket already existed. Is there anything like `update_resource` in Troposphere or an alternative of just updating life cycle policy of S3?