General aviation pilot reported a near miss with a large transport aircraft while approaching an airport. Pilot took evasive action and continued to airport.

Narrative

Following a short local personal VFR flight I was maneuvering in Class E airspace @ 3;000' AGL in the vicinity of a popular VFR reporting location ZZZ1 in anticipation of an eventual VFR approach and landing at ZZZ. I was monitoring ZZZ Tower in preparation for contacting them for entry into their Class D airspace. While positioning my aircraft for my arrival my ADSB suddenly depicted a traffic conflict alert indicating a high-speed target approaching my position. It seems I received very little warning possibly due to the approaching aircraft's relatively high-speed (est. @ 220 kts?) and the 8-nm scale being depicted on my moving map display. At about this same time the ZZZ Tower transmitted in the blind to my specific aircraft that they observed a potential traffic conflict requiring my evasive action. Since I was already taking such action I replied that I had the aircraft in sight and was adjusting my course/altitude to avoid conflict. The aircraft (an Company X A319) passed below and behind me and proceeded to land straight-in on ZZZ's RW XX. I subsequently requested and received a ZZZ Tower clearance for entry into the Class D airspace for a landing on RW XY.Observations: 1.) The ADSB traffic alert system works well and provides very useful traffic positional and alert information. 2.) The ZZZ Tower personnel were very observant in providing me with the timely traffic alert -- this is particularly true when one considers that I had not yet established communication with them for an ATC clearance into their Class D airspace.Suggestion: Over recent years ZZZ has experienced a significant increase in air traffic by medium-size air carrier aircraft (e.g.; A319; B737; etc.). This increase has been well managed by tower; the airport admin; and the pilot community. In light of this increased air carrier traffic perhaps we need to reemphasize to the pilot community some of the more frequently utilized low-altitude approach/departure routing flown by these larger aircraft.