How to correctly form WHERE in MODX?

Question

MODX

I make the output of resources containing a certain id in the service field in this way:

[[!getImageList?
    &tvname=`migx_testimonials`
    &tpl=`migx_testimonial_tpl`
    &limit=`5`
    &docid=`1`
    &where=`{"service:=": 2}`
]]

If the service field contains only one id, then everything works fine. The service field can also contain several comma-separated id's. In that case, &where=`{"service:=": 2}`it doesn't work.
How to correctly form a where condition so that resources are displayed in both cases?

Answer 1

Instead of = write in