Using runtime variable for stream name

[RINDLU]

It would be great if it is possible to make the stream name dynamic.
For example in this case, {YYYY}-{MM}-{DD} is used to define the stream.
See the replication yaml file below:

source: S3
target: SNOWFLAKE

defaults:
mode: truncate

streams:
test/{YYYY}-{MM}-{DD}/SITE_20*.csv:
object: 'testschema.site'
single: true

When running, the variables are not resolved.
This feature will allow to dynamically get the files everyday from the right current folder.