Is it possible to calculate the COUNT for each element_id grouped by another field?

Question

MySQL

Tell me about this question:
Here is a piece of the table:
I want to count the number of elements for different sim_id
And get the following as a result:
sim_id|number of elements 42|number of elements 43
20|5|3
21|1|0
Is it possible to do this in one query ?