How to place an ad in exoplayer at particular position and control it's play and pause

I want put 3 linear ads in exoplayer using ima, prerol, midrol, postrol using exoplayer Android. But if I will get 0 flag from firebase remote config then. I want disable that particular ad(prerol/midrol/postrol)

Thad adtagurl is linear, so I also want to put it at particular position for midrol then is it possible.

This adtagurl is vast not vmap, as I want to control it from player.

So my first question is, Is it possible to achieve this. Second if possible then how.

I am stuck in this, any help is appreciated.

Thanks

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