Currently there is no TSS to RACF conversion utility.
There is some documentation that documents what TSS commands equivalent in TSS.
CA Services does have services that can be used to converts a RACF database to a CA Top Secret database.
Please submit an idea on Ideation so it can be conidered for a future release.
To request enhancement requests, please submit your idea to Ideation (https://communities.ca.com/docs/DOC-231151636), so it can be voted on by the community. The more votes the greater the chance it will be included in the product.