Not directly.
If there's a particular post which is currently being boosted too much, a workaround is to temporarily mute the account of the person who wrote the post that's being boosted.
Before you confirm a mute, you should see an option to set the duration. By default it's forever but you can change it to just be a few days, hours or minutes.
This would also hide all of the post author's posts, but if you've set it to be temporary this may be a good tradeoff.