Hi @VenkataPabbisetty
As of now there is no official Microsoft documentation available for this integration. However, you can reference the documents for other SAML based IDPs and try updating your custom policy files with similar parameters for ServiceNow.
Below are the documents for integrating SAML based IDPs that you can reference:
Please do not forget to "Accept the answer" wherever the information provided helps you. This will help others in the community as well.