To get a single input line, you obviously can write:
abcd=[5, 10, 5, 10];//[[-100:100], [-100:100], [-100:100], [-100:100]]
variable= [[abcd[0],abcd[1]], [abcd[2], abcd[3]]];
echo(variable);
However, you are right, this is just a work around, as the customizer isn't as structure sensitive as it could/should be.
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