Can you be grateful without being grateful to someone (or something)?

Can you have a genuine feeling of gratitude without implying or assuming that there is some being or agency that you’re grateful to? If not, what does gratitude mean, then?

So if you’re not talking about a known person or entity, but just a general feeling (e.g., “I’m grateful not to have covid-19” or “I’m thankful that we can be together”), and you’re a committed atheist, is what you’re feeling really gratitude, or something else?

Or would you argue that the feeling itself is evidence that you really do believe in some magnanimous being?