Stop video ads in apps?
I don't think there's a way to disable certain type of ads appearing on Android apps without using an ad-blocker.

The idea is to force users to switch to paid versions.

You may, however, choose between "personalised ads" or non, using Google account dashboard.

For me, using a VPN helps disable internet access to selected apps. This minimises to a certain extent, the number of ads I see. Also, some VPN compress most ads that I still have to see, so I save data that way, too.

I, personally, use Opera Max. There may be others, too.

But be careful, though. Some apps don't work without internet access.