Option 1:

1. Create a Report Type on Chat Transcripts object.

2. Create a report on the custom report type from step 1. Set “Is Chat Bot Session” to true in the filter.

Option 2:

1. Install the below AppExchange Einstein Bot Analytics.

https://appexchange.salesforce.com/appxListingDetail?listingId=a0N4V00000FNBrHUAX

2. Go to Reports tab and select “Einstein Bot Reports” folder.