SDKBOX Play - how to get ios global rank for leaderboard?

I’m trying to migrate from handmade obj-c GKLeaderboard bridge to sdkbox play api, and encounter a problem: my score algorithm get current user rank, get global rank (number of entries in leaderboard), and calculates player rank in 5-stars rating. sdkbox play can get my rank (2444 for example), but without know how many players in leaderboard (leaderboardRequest.maxRange in GKLeaderboard obj-c) this info is worthless. Any advice how to get leaderboard maxRange (players count) will be appreciated.

https://drive.google.com/open?id=1HNf-VqnmkDdDGWl3tZm63w5AiwDc_xQ4

have a try.

invoke getPlayerCenteredScores, and check json_with_score_entries value in onPlayerCenteredScores;

I will give it a try, thanks!