Cessna 180 pilot reported NMAC with another aircraft while entering traffic pattern at non-towered airport. Pilot took evasive action to avoid a collision.

Narrative

Approaching ZZZ from North; made initial call to ZZZ radio from about 5 miles North of airport. Had heard Aircraft Y call departing Runway XX (active runway due to winds). While searching for helicopter traffic noted at my 9 clock low; but converging in ADSB; my copilot called out traffic at 12 o clock. Looking around my V-brace and Inreach; I noted a closing aircraft just right of my 12 o clock; opposite direction. I estimated a collision imminent within 2-3 seconds; so I took immediate evasive action by executing a left break turn with a descent. I heard no other radio calls from Aircraft Y as they climbed out of the Runway XX downwind leg; and I believed my spacing from the airport to be sufficient to safely enter a 45 entry leg. At that point I elected to complete a full stop landing instead of conducting currency landings. I don't believe visibility was a problem as the sun angle would've been at the other aircrafts 10-11 o clock and I was at their 1230 with my Landing light operating in Pulse mode.