Making a colums total (SUM) with Views

Popular Drupal 7 modules such as Views Calc and Views aggregate plus are not available for Drupal 8, so I’m struggling with achieving the following :

  1. Making the sum of a column (of one integer field of list of nodes) without any custom code (no matter what I do with the “Use Aggregation” feature , I keep on getting a list of the values of entities meeting my criteria and not the sum).
  2. Make this (single) value available to another entity as a reference to the view (currently empty, possibly related to the fact that my views output is a list instead of a single value).

enter image description here