If this is an actual wood burning fireplace -

you might still be able to remove the two rows of brick, and use a concrete saw and chisel - and cut/smooth down the concrete to the required level.

HOWEVER - before you do this - you would need to examine the outside structure carefully. And probably have a chimney person come on out, and give you some advice, or what he thought options would be, and how much possibly they wouold charge.

Reason being - a wood burning fireplace needs a chimney. A true birck chimney WEIGHS a lot! Concrete has been used as a foundation for a brick chimney. So you need to know what the concrete is doing, purpose of, etc. before you go cutting into it. But I have a lot of concrete tools, and concrete cutting tools do exist, so it could be cut... just need to know more stuff before you go messing with it.

Might even ask a structural engineer to come on out, and take a look. Depends on how bad you want to watch Frasier with the TV at the desired height :)