Kejriwal made the announcement at Grewal's village Bamla near her where he attended the army veteran's cremation.
Amid high drama, the Chief Minister had been detained by Delhi Police yesterday when he ried to meet the family of Grewal.
"I want the people to take his fight forward. We will fight till our last breath and snatch OROP from the Centre. Our soldiers deserve what is their due," Kejriwal told reporters here.
Under the AAP government's compensation policy, the families of martyrs who are residents of Delhi are given Rs one crore.
Kejriwal has been repeatedly urging Prime Minister Narendra Modi to implement the same across the country.
Congress Vice-President Rahul Gandhi and other political leaders also reached the native village of Grewal, who had committed suicide by consuming poison at a park in New Delhi area on Tuesday evening.