Troops from the Pakistani armed forces need to be deployed to help the police fight crime.

I don't know the exact statistics of crime rates in Pakistan, but I can assume things aren't getting any better especially with the political instability 2008 onwards alongside our growing overpopulation crisis.
Add to that the skyrocketing prices of food that have hit Pakistan. It is unlikely that crime will improve or crime rates will decrease. Most likely the opposite is happening.

I looked up some Pakistani police websites and it confirms newspaper reports of frequent police deaths that one of my parents mentioned.
Fighting criminal gangs in Pakistan is like almost fighting a mafia. With the availability of illegal firearms and other weapons, the police are quite vulnerable to getting injured or killed by these gangs, especially during raids and clashes.

Most readers may not know, but the police in Pakistan, especially Karachi and other undeveloped areas are in no shape to take on these mafia type gangs.
The police in Pakistan usually prefer job applicants who have been with the armed forces or have basic training in army-style combat.

But unfortunately, most police employees in Pakistan are poorly trained and equipped and have little or no training in their background when joining the police force. Protective clothing is also very limited to the police, so getting hurt or killed is quite easy for them. That can perhaps be changed if the armed forces spared a few dozen troops for raids and combat missions for the police.

Pakistan's army has about six hundred and fifty thousand troops (don't know how accurate the sources are, but I'll go with it). Is it possible that out of these six hundred and fifty thousand troops that a few dozen can be spared to assist the police during raids on gangs and fighting crime?

It would certainly help save police lives and help defeat the criminals. It could also serve as good training for the troops.
I do not believe that from these six fifty thousand troops that all of them are active on the front lines for war.

Why not put them with the police to help them? It will keep the troops busy and keep them well trained so when the time for war comes, they are still prepared and the police's job can be made somewhat easier and safer.