Hello Tarun,
Currently, we do not have an official syncpack to integrate SL1 to HaloITSM using PowerFlow. However, you are able to create your own integration syncpacks by following our documentation here Creating a SyncPack.
I also recommend submitting this as a feature request to our Ideas Hub to see if our Product Management team would develop an officially supported syncpack.
If you require assistance with the creation of a syncpack, please reach out to your Engagement Manager and they can put you in contact with our Professional Services team.
Antonio Andres
Principal Technical Support Engineer | ScienceLogic