Don't forget to add it to "devDependencies". Tested on Expo v53
Source: https://github.com/expo/examples/blob/master/with-pdf/package.json#L20-L21
package.json
"devDependencies": {
...
"@config-plugins/react-native-blob-util": "^0.0.0",
"@config-plugins/react-native-pdf": "^0.0.0"
},