Capture One 10.2.1 now added RAW support of new announced Sony a7R III, Sony RX10 IV, and Sony RX0 cameras.
10.2.1 Camera Support:
10.2.1 Lens Profile Support:
Sony FE 100-400mm f/4.5-5.6 GM OSS (SEL100400GM)
You can download Capture One 10.2.1 here.