I want to add an icon to the map, but I get INVALID INPUT MARKERS

Sorry, I have solved the original problem, next, I want to add an icon to the map, but I get INVALID INPUT MARKERS NEEDS TO BE REPRESENTED AS JSONARRAY

The add circle block doesn’t retrun a json string,So this won’t work.

So what should I do? I don’t know how json works. Would you like to point it out for me? I will be very grateful

You can use this website to generate json of your markers:
http://geojson.io/

Means I want to design a logo on this website? Then?

Is this a block that marks a fixed position? I want to make a mark that can be placed along with the longitude and latitude. What should I do?