Your fixture request has been added to the AtlaBase library. It will be reflected in the next rekordbox fixture library update (performed once a week on Wednesday or Thursday except for the national and company holidays). Please find the latest list of the library fixtures here (under Fixture library lists).
Fixture: LED Bar 240 RGB
In the meantime, until library gets updated, you can use the existing LED Bar 240 leds 8 by Schalter which is identical.
On behalf of Pioneer DJ,