[{"@context":"ABC","entity":"PQR","URL":"abc@yahoo.com"}]
[{"@context":"RST","entity":"UVW","URL":"efg@gmail.com"}]
.............
............
............

@context    entity     URL
ABC         PQR        abc@yahoo.com
RST         UVW        efg@gmail.com
...         ...        .......
...         ...        .......

from  itertools import chain

L = [[{"@context":"ABC","entity":"PQR","URL":"abc@yahoo.com"}],
     [{"@context":"RST","entity":"UVW","URL":"efg@gmail.com"}]]

df = pd.DataFrame(list(chain.from_iterable(L)))
print (df)
  @context            URL entity
0      ABC  abc@yahoo.com    PQR
1      RST  efg@gmail.com    UVW