How to filter the fields that has a dictionary in as a value?

[prabhanjali11]

Summary
I am trying to query some data in postgraphile but the column that I have specified has the value as a dictionary. I need to query the field based on the key inside that.

My Query:
query{
table(filter:{ col1: {in : ["basdskd","fdhasj"]} col2: {like: "14%"}}){
nodes{
col1
col2
col3
}
}
}

Present Output:

{
col1: basdskd
col2 : 14.2
col3 : {
"a:key1" : val1
"b:key2" : val2
"c:key3" : val3
}
}

from here if I need to add a condition/filter to select the rows where "c:key3" value is "val3", How would I proceed with that?