Update 2/20/23: This is now showing up for more people.
Chase is now letting users request credit limit increases via the Chase app and no hard credit pull is done. Previously Chase has always done a hard pull for credit limit increases. Currently this feature is not available to everybody but if you’re eligible it should show as “Request a credit limit increase” under “Transfer A Balance”. It also looks like only pre-approved credit limit increases will avoid the hard pull as it states “preapproved increases will not have a credit pull”.
Hat tip to reader Brian
Source: doctorofcredit.com