Data stream tracks generation

Hi!
There is information about following convention:

.ds-<data-stream>-<yyyy.MM.dd>-<generation>

But when define data stream in index template like this:

"index_patterns": ["my-data-stream-*"],
"data_stream": { }, 

There is no option to choose how backing index is creating.
So based on information about convention my index must be like this:
.ds-my-data-stream-2021.06.12-00001 but in real we have .ds-my-data-stream-00001
Is it possible to define how my backing index will be creating throw index template?
Thanks!

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Any thoughts?