Here is a look at the xG (expected goals) stats from Napoli vs Barca (Official attendance of 49,529 in Naples for this UCL Round of 16 First Leg clash).
Napoli did not have a single shot in the first half- they had a xG of 0.00 for that period.
xG Napoli 0.90-0.67 Barcelona shots map (Actual score NAP 1-1 BAR)
0-1 Lewandowski goal vs Napoli xG 0.11
1-1 Osimhen goal vs Napoli xG 0.55

Napoli vs FCB 1-1 Match Stats for comparison
(Napoli stats on left; Barca on right)
Also check out xG stats for Porto v Arsenal First Leg