Yes, offsets are available in 15°, 30° and 45° angles.
45° elbows cannot be used for wood burning fireplaces in the USA, Canadian installs can use them.
30° elbows are most common, an easy rule for offsetting is: it takes twice the vertical space to equal the offset distance. If you want to offset the chimney 12” side to side, you’ll need 24” in height to move the chimney over. In most situations, the chimney has to stay over the foot print of the fireplace.
Please refer to chimney offset chart provided by your Fireplace Advisor.