Any way to automate the 15% US non-resident withholding tax ?

Is there a way to automate the 15% non-resident withholding tax for US investments?
My portfolio has the field 'dividend received' automatically completed with the TOTAL dividend and the NRWT field empty. Currently, I need to manually recalculate the NET dividend and enter this in 'dividend received' and then complete the NRWT field. Is there a more automated way to do this?
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