>>> print(f)
Field: specific_humidity (ncvar%q)
----------------------------------
Data            : specific_humidity(latitude(5), longitude(8)) 1
Cell methods    : area: mean
Dimension coords: latitude(5) = [-75.0, ..., 75.0] degrees_north
                : longitude(8) = [22.5, ..., 337.5] degrees_east
                : time(1) = [2019-01-01 00:00:00]

>>> print(f.collapse('mean'))
Field: specific_humidity (ncvar%q)
----------------------------------
Data            : specific_humidity(latitude(1), longitude(1)) 1
Cell methods    : area: mean latitude(1): longitude(1): mean
Dimension coords: latitude(1) = [0.0] degrees_north
                : longitude(1) = [180.0] degrees_east
                : time(1) = [2019-01-01 00:00:00]