The DelSigADC API has several functions that convert the digital reading into voltage values.
As usual there are some example projects availlable. Just right-click on the ADC component and select "Find Example Project". Choose one without DMA first, will be easier for you.
Your reading off the shunt R produces an equivalent instantaneous I.
Ohms law. The V read is instantaneous V. So now you have to correct
for reactive loads. Google "embedded power meter ac line", lots of ap
notes on basic calculations and period measurement to do the calculations.