Sql Server - How to convert Audit log into a table?
Capturing DML operations on individual tables is among the auditing features that are not available in Standard Edition. 

If you want to trace DML operations, another possible hook is Extended Events. You won't be able to use the auditing package, but you could use lock acquired events to capture read and write operations.

I blogged about it here: https://spaghettidba.com/2015/04/20/tracking-table-usage-and-identifying-unused-objects/

Other options are:


Triggers: this is easy to set up, even automatically by generating the trigger code. Downside is the increased write overhead.
App-side logging: If you have control over the application, you can inject the code needed to log accesses to the tables.