How do I set the partial route api.strict option?

| Q | A
| ----------------- | ---
| Bug? | no
| New Feature? | yes
| Framework | Laravel
| Framework version | 5.7.18
| Package version | 2.0.0-alpha2
| PHP version | 7.2.15

#### Actual Behaviour

set .ENV `API_STRICT=true` and request header `Accept:application/vnd.xxx.v1+json` it's work.
but third service request no header `Accept:application/vnd.xxx.v1+json` and I can't ask them to correcting something.
I tried set `config(['api.strict' => false])` in loaded middleware, not work.

#### Expected Behaviour

`Accept header could not be properly parsed because of a strict matching process.`

#### Steps to Reproduce

#### Possible Solutions

`$api->get()->apiStrict(false);`?