The adapter that you illustrate is not suitable/recommended.
As a safety measure, so to avoid the creation of an equipment-damaging configuration, USB-C “standards” do not generally permit the use of adapters. Additionally, adapting a USB-C interface to a lower specification USB cable will compromise both data and power transfer performance.
The Power Adapter supplied with your iPad Air4 has a USB-C port - and features USB PD (Power Delivery). Your iPad, using USB PD can charge at its maximum supported rate (20W). Standard USB Power Adapters have a lower power rating; when using standard USB Power Adapter, your iPad’s maximum charging rate falls to 12W (2.4A @5V).
The best and safest route to charge your iPad is to use the supplied Power Adapter. You can then use the correct “USB-C compliant” (and preferably MFI Approved) cable for your other devices - sourced from a reputable manufacturer (e.g., Apple, Zagg, Anker, Belkin etc.).