Unable to access related records for multi-select lookup via REST API

Given I have `foo` and `bar` data fields:

Campaigns.foo - simple lookup field, linking deals module

`Camaigns.bar` - multi-select lookup field, linking deals module

I am not able to retrieve the multi-select one in the records list REST API:

/Campaigns?fields=bar`

... does NOT return bar values

"data": [
{
"id": "...",
...
},
...
],

It does work for the simple lookup though

`/Campaigns?fields=foo`

"data": [
{
"foo": {
"name": "...",
"id": "..."
},
"id": "...",
...
},
...
],

multi-select values are returned only when requesting a single record, i. e.

`/Campaigns/<record_id>`

is this a known limiation? I want to avoid looping over list results for obvious performance reasons.

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