See: question.
I found a label for can of artichoke hearts online that weighed 13.75 oz. The can’s content is 13.75 oz. Total fiber is 14 g.
According to the study titled “Relationship between Physical and Hydration Properties of Soluble and Insoluble Fiber of Artichoke”, regarding artichoke hearts: “insoluble dietary fiber (18.11%) and soluble dietary fiber (26.74%).”
So, the soluble fiber in artichoke hearts is a little less than 1/3 the total. That means the soluble fiber comes in at at about 4.5 g.