Kind of looks like this extension might be somewhat abandoned, but figured I'd report here just in case.
Directus 9.22.1, I was finally able to get the Image Scout interface to work as a field via:
Create Field -> Input -> Type UUID -> Continue in Advanced Mode -> Interface tab -> Delete "Input" -> Select Image Scout -> Save
That all works OK, but viewing a record in the UI throws the following JS errors from the interface:
runtime-core.esm-bundler.22ec0346.js:1 TypeError: Cannot read properties of undefined (reading '_c')
at Proxy.f (index.js:2:26554)
at Jt (runtime-core.esm-bundler.22ec0346.js:1:17405)
at dn.T [as fn] (runtime-core.esm-bundler.22ec0346.js:1:51669)
at dn.run (runtime-core.esm-bundler.22ec0346.js:1:4937)
at G.c.update (runtime-core.esm-bundler.22ec0346.js:1:51939)
runtime-core.esm-bundler.22ec0346.js:1 TypeError: Cannot read properties of undefined (reading 'api')
at Proxy.getProviders (index.js:2:23494)
at Proxy.mounted (index.js:2:26436)
at runtime-core.esm-bundler.22ec0346.js:1:31933