Ask HN: Is there anything I can do with an Apple Watch without an iPhone?

Title says it all. I got an Apple Watch from my job but I have a Pixel 4a. Tried setting it up and it appears you MUST have an iPhone to use it.

Is there anything I can do with this thing besides sell it to someone who has an iPhone?

For what it's worth, the only thing I really care about there is the heart rate and O2 monitor. I would love to decouple those features if I could.