We can not find a way to use segments with runReport method.
Tried to get reports with segments in Google Analytics, we can get them like below.

But now, there's no property for them in parameters of the "runReport" method in Google Analytics Data API v1alpha.
ref: Method: runReport
- entity
- dimensions[]
- metrics[]
- dateRanges[]
- offset
- limit
- metricAggregations[]
- dimensionFilter
How should we request "runReport" with segments?