Some on-air histories of the UNC-TV network mentioned Jefferson Standard originally seeking channel 4 in the Triangle, but ceasing to do so when they found out the University of North Carolina sought it for educational TV--even going so far as providing the university with the paperwork and engineering research they'd accumulated in trying to get a commercial channel 4(the UNC-TV headquarters in Durham's Research Triangle Park actually are named for longtime J-S president Joseph Bryan and his wife, Kathleen). However, I've not seen anything about this in old Broadcasting Yearbooks, etc. The only evidence of this I see beyond the UNC account is the '47 Table of Allotments with VHF 4 assigned to Durham, where it would have been available for commercial use. It most definitely would have changed the Raleigh-Durham market dynamics and likely the fortunes for NBC had channel 4 remained a commercial allocation here. Interestingly in later allocations, Durham later picked up several less-than desirable UHF frequencies--a non-commercial 40, and commercial 46 and 73. Local commercial interests attempted to sign-on a WCIG-TV 46 and local radio station WSSB (now WDUR 1490) pursued a TV operation on channel 73, though none of these actually made it to air--by the late 1960s, these were all gone from Durham's allocations with UHF 28 moving over to Durham from Raleigh.
As for the channel 5 allocation later added in Raleigh, I'm not aware of Jefferson Standard having pursued that, though they certainly might have. The well-known story about VHF 5 in Raleigh is that two local companies--Durham Life Insurance Company and Capitol Broadcasting had a battle royal for that one. Durham Life, by far the larger of the two, thought that they were a shoo-in for "WPTF-TV 5" and went so far as to build a TV studio and prepare one of the towers at the WPTF transmitter plant for a batwing antenna. However, channel 5 would go to the smaller Capitol, the owner of WRAL 1240 AM, and went on to have one of the most successful local TV operations in the country.