Integration with upper bound depending on x

Dear All,
I am trying to integrate a function of x in 1D between 0 and x for all x and create a new continuous function, varying with x. It seems the integration coupling (intop) does not have the option to specify this variable upper limit and only works over the whole domain, giving a constant value for the integration at every point? Is there a different way that I could try to do this in COMSOL?

Any help much appreciated,
Thanks.