Also you could use APIs from other services like some random website which offers csgo statistics lookup but these, here shown in example on csgo-stats.net are limited for the accuracy aswell on the same fact: https://csgo-stats.net/tools/steam
Since I will program it as part of a big project anyway, I will take care of it.@Everybody:
Is there somebody who could create this kind of script?
Unfortunately I'm just at the beginning of programming and scripting (and even don't have any experience with Javascript).
Thanks.
Could take a few weeks, since it's not a primary project at the moment, but if you can wait that long (probably 3 weeks), then I'll do it to you.
Thanks ^^BTW: Maybe an interesting thing I have found regarding collecting a CS:GO Rank.
Don't know if it's useful for you.
Github node-csgo