It looks like if you were going to make the same strawberry jam recipe I’m making, you’d fill 3 of the .25 liter jars, with about 3/4 of a jar worth of jam leftover. You’d maybe get 4 full jars out of the recipe. (I sometimes get a little more leftover, that I usually just eat right away, but that might be just enough to fill that 4th jar for you.)
Since the jars do seem to be different standard measurements, you might want to just watch me make my jam, and then follow a recipe formulated for your standard size jars. Like this one. (Giant pet peeve though: that recipe doesn’t say how many jars it makes/or how many ml of jam it produces, meaning it’s hard to know how many jars to prep when canning.)