Hello @TomasAE,
You can create this chart by placing a content table in the dashboard. Select the table, go to the advanced tab, and select install. Say Ok to the window that pops up.
After that you will see over in the toolbox a statistics collector has been installed. Open that statistics collector and go to the column tab. You can add in columns for the statistics you would like to know. Change the update timing to be When the value is accessed.

Notice for current content the code is
getstat(data.rowValue, "Content", STAT_CURRENT, instance)
and for minimum content it is
getstat(data.rowValue, "Content", STAT_MIN, instance)
The other statistics are similar.
Once the statistics collector is updated how you want don't forget to select those columns to be shown on the chart (select the chart and then look over in the properties window).

Content Chart.fsm