Capture One doesn't currently read Sony's compressed RAW formats from the A7RVI. I worked together with ChatGPT to develop a small utility called RAW Bridge. It automatically identifies supported and unsupported Sony ARWs, converts only the unsupported ones to Linear DNG by employing Exiftools and Adobe DNG Converter via embedded script, leaves the originals untouched, and preserves a clean workflow for importing into Capture One. I currently tested it on the Sony α7R VI and macOS and it works flawlessly.
Let me know if someone is interested. I can post the installation instructions, Terminal commands and scripts here.