How should i use delivery_frequency in sellingPlanGroups query

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I am trying to filter sellingPlanGroups by the delivery policy.

When I am doing something like:

sellingPlanGroups(first: 20, query:"delivery_frequency:day")
I am getting the groups with the days' interval policies, but it is of course not what I want;
I want to filter with the specific interval count.

When I am trying to do something like

sellingPlanGroups(first: 20, query:"delivery_frequency:3day"),
sellingPlanGroups(first: 20, query:"delivery_frequency:day3")
sellingPlanGroups(first: 20, query:"delivery_frequency:3 day")
...

or even:

sellingPlanGroups(first: 20, query:"delivery_frequency:3")

I am failing to get the groups.

I assume I am missing something cause it seems pretty weird I can only filter on the interval type and not the interval count.
I couldn't find any example for this kind of query, can you please help me with that?