comulative flow chart

Hey everyone,

 I got a request to build "a cosmic ship" :)

 I need to show the amount of task through it's status during the period, but everyday it must include previuos tasks + new task.
What I have is columns Work date (date format), Issue Key ( exp. HND-254, PSD-36 and ect.) and Issue status (Done, Testing, In Progres, New, Backlog).
And I need to show in area chart their change as in Example 1, but when I try to manage it in Power BI it comes like in Expample 2, as I understand some how I have to calculate day issue = previuos amout + this day tasks.

Could anyone hep me?