It sounds quite unnatural. I recommend using something like "I like watching football." or "Watching football is my hobby." instead :)
2019年9月9日
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Not bad. I’d probably say: One of my hobbies is watching football.
2019年9月9日
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Yes it is totally ok!
You can also say: "I love watching football.", "One of my hobbies is watching football.".
2019年9月9日
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My hobby is ....
One of my hobbies is ...
The other question is whether “watching football” is a “hobby”. Described that way it sounds too passive to qualify as a hobby. A hobby would typically involve more than mere watching.
2019年9月10日
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Better would be
I like to watch football
Or
I am a football fan