Thank you for posting your query on Microsoft Q&A, From above posted query I could understand that you are looking for "claims" "value" defined within custom policy.
Please do correct me if this is not the case by responding in the comments section.
- When you use Azure AD B2C, you have fine-grained control over the content of your tokens. You can configure user flows and custom policies to send certain sets of user data in claims that are required for your application. These claims can include standard properties such as displayName and emailAddress. Your applications can use these claims to securely authenticate users and requests.
- The claims in ID tokens aren't returned in any particular order. New claims can be introduced in ID tokens at any time. Your application shouldn't break as new claims are introduced. You can also include custom user attributes in your claims
- The following table lists the claims that you can expect in ID tokens and access tokens issued by Azure AD B2C by default.
The claims schema is the place where you declare your claims for user to input values
For example in below defined "ClaimsSchema" the claim name is "surname" and the value will be input by user within "TextBox":
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