How to create geomap from loki?

hello every
here is my log

2024-08-18 10:12:10.441	
{"epoch":1723975873,"entry_type":"disconnect","outter_ipv4":"118.163.48.118","city":"Hsinchu County","country":"Taiwan","geohash":"wsqhm5e4"}
2024-08-18 10:12:10.441	
{"epoch":1723975883,"entry_type":"connect","outter_ipv4":"36.230.132.19","city":"Hsinchu","country":"Taiwan","geohash":"wsqj0gbh"}
2024-08-18 10:12:10.440	
{"epoch":1723975879,"entry_type":"connect","outter_ipv4":"118.163.48.118","city":"Hsinchu County","country":"Taiwan","geohash":"wsqhm5e4"}
2024-08-18 10:11:09.899	
{"epoch":1723975809,"entry_type":"connect","outter_ipv4":"118.163.48.118","city":"Hsinchu County","country":"Taiwan","geohash":"wsqhm5e4"}
2024-08-18 10:11:09.899	
{"epoch":1723975851,"entry_type":"disconnect","outter_ipv4":"36.230.132.159","city":"Hsinchu","country":"Taiwan","geohash":"wsqj0gbh"}

I have create panel with this query and use heatmap layer type

{source="geoip_helper"} | json | entry_type = `disconnect`

here is my result

but I don’t know how to use Markers layer type
I hope Styles - Size can auto change by count of log
and show legend
just like this doc

how do I change my query to accomplish ?