Accessing JWT payload to implement row level filters

[vishnuramvs29]

I want to display specific data to users based on a value in my table. For instance, I have a table called users with columns username and tenant_id. I need to filter the data shown to the user according to a tenant_id value stored in the JWT payload. How can I access the payload within an SQL query or system property to enforce a policy that only shows relevant data to the users and hides everything else?