Just apply CONSTANd (the normalization algorithm used in QCQuan) to your matrix of (aggregated) quantification values.
If you have multiple experiments, you need to normalize each matrix separately.
Initial Publication: Maes, E., Hadiwikarta, W. W., Mertens, I., Baggerman, G., Hooyberghs, J., & Valkenborg, D. (2016). CONSTANd: A normalization method for isobaric labeled spectra by constrained optimization. Molecular & Cellular Proteomics, 15(8), 2779-2790.