Modify the shape of your data or update your data with the new Transform element in Flow Builder. You can automate data transformation such as mapping fields between flow resources and specifying a formula to transform a value.
Learn More:
Help: Transform Data in a Flow - https://help.salesforce.com/s/articleView?id=sf.flow_build_logic_transform.htm&type=5
Help: Flow Element: Transform - https://help.salesforce.com/s/articleView?id=sf.flow_ref_elements_transform.htm&language=en_US&type=5