xarray.sel() nearest value that is not NAN

[Surfix]

Hi guys,
I have xarray object with so many NAN values. I have a point of interest that I want to find the value. I use xarray.sel() method. However, the value at this point is NAN. I want to select the nearest value to the point that is not NAN. Is there a way I can walk around this?
I attach a picture here for reference. I appreciate your time. Thanks.