Can I use a for loop to specify constraints in a linear problem using cvxr?

Question

Suppose I have a LP problem, in which:

• w is a constant column vector of dimension r

• a is a constant column vector of dimension r

• p is a constant column vector of dimension T

• d is a matrix variable of dimensions (r,T)

I have to insert the following constraint in an LP problem:

I've been using R and CVXR for a short time, so I can't figure out how to insert that double summation. Would anyone know how to help me?