Change AG readable Secondary from "Read-Intent only" to "Yes" - downside?

I have a 2014 AG that has the readable secondary set to Read-intent only, and I would like to change it to Yes so that a SQL job can connect to it.

Is there a downside or downtime to making this change?

Alternatively, is there a way for my job to specify ApplicationIntent=ReadOnly?

Thanks,

Kevin3NF

22 years of database experience, most with SQL Server. Please 'Mark as answered' those posts that helped you.