Plan custom fields doesn't display, when requesting all plans

Plan custom fields doesn't display, when requesting all plans

So, i created 5 different plans and created custom field for them (test_field). I inputed value in this field in every plan. However, when i use method to request ALL plans - it doesn't return custom fields. This parameter returns as empty array for every plan. Like this:

...
custom_fields:[]
...

Is there possibility to display custom fields of plans when requesting ALL plans? I want to achieve something like this:

...
custom_fields:[field_a:1]
...
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