There are no templates, that's more of a pool thing. However you config your knots mempool determines what you mine. There are some good videos on YouTube on how to configure your mempool and what the various options do.
Discussion
This is exactly what I've been looking for. Good looking out
Question now is, if the block templates are handled by knots is there an advantage to using datum over public pool? I like that I can see more detailed share info on datum but public pool gives me best difficulty measurements. I've noticed public pool has had server outages several times. Not sure if datum is fully hosted on my node or relies on third party servers as well?