>Does enterprise edition primary and standard edition secondary support readable secondary

No.  Standard Edition can only use Basic AGs, and EE _can't_ use Basic AGs.  So you can't have any sort of AG between the two servers.

[![enter image description here][1]][1]

[Editions and supported features of SQL Server 2019][2]


  [1]: https://i.sstatic.net/0wN1J.png
  [2]: https://learn.microsoft.com/en-us/sql/sql-server/editions-and-components-of-sql-server-2019?view=sql-server-ver16