Is it possible to lower the front/inner part of the eyebrow?

A short scar temple lift (lateral brow lift) can be done with incisions hidden behind the hairline in most. It will give the illusion that the inner (medial) brow is lowered in relationship to the  lateral brow which is elevated. If you still want the inner brow a bit lower you can use Botox selectively.

You describe the ideal brow shape, which has the outer part (tail) higher than the inner part, with the peak of the arch more lateral. Most of the time when the tail of the brow is raised and the peak of the arch set at the right level, it is not necessary to actually lower the inner part. This can be done with a temporal brow lift. It is easy to lower the central brow by Botoxing the central forehead, which relaxes the muscles that elevate the brow.

Actually, Botox or an equivalent product, properly done, can be very effective at both lowering the medial brow and raising the lateral brow----sometimes too much giving a "wicked" look!

Without photos it is hard to give a specific recommendation.  Botox can alter the brow contour and height to some degree.  Surgically, a lateral brow lift can lift this area and an upper blepharoplasty (if there is some extra skin) could be performed as it will depress the eyebrow some and some lowering of the medial brow could be achieved relative to the outer brow if minimal skin is removed laterally (outside) area especially if the lateral brow lift was performed.  This is theoretical to you, however, without a formal exam and photos.  Generally, the ideal female brow arches slightly with the apex at the junction of the inner 2/3 and outer 1/3 of the eyebrow.  Generally a more feminine brow shape can be obtained by lifting the outer brow portion by an internal browpexy or lateral brow lift and not having to "lower" the medial brow.

It is possible to lower the inner eye brows while raising the outer tail. This can be done by botox injection. Direct brow lift or lowering is a more permanent alternative.