The solution is to add one small option --collectCoverageFrom to collect only for a certain file (i.e. component). This is based on this post
NPM version
npm test my-component.test -- --coverage --collectCoverageFrom=src/components/my-component/my-component.tsx
Notice an extra -- before --coverage.... This needs to be passed for npm as following options provided will not be taken into consideration without it.
YARN version
yarn test my-component.test --coverage --collectCoverageFrom=src/components/my-component/my-component.tsx
This will show coverage table only for my-component.tsx.
NOTE:
The path to my-component.tsx file needs to be relative to project root and exact. It cannot be relative as I did for my-component.test.