Notes
This will work when there is a single approver specified but not when there are multiple. Blue Ocean will respond with a 400 error. Due to JENKINS-42920 the user will not receive feedback on why they are not allowed to proceed or any other error, which made this problem more confusing.

To run these scenarios you will need two users - 'alice' and 'bob'.

Scenario 1 - current user is 'alice', single approver
This works fine in Blue Ocean

node {
    echo 'hello world'
    input message: "Do you want to approve this job to deploy to production?", ok: "OK", submitter: "alice"
}

Scenario 2 - current user is 'alice', multiple approvers

node {
    echo 'hello world'
    input message: "Do you want to approve this job to deploy to production?", ok: "OK", submitter: "alice,bob"
}

Original request
I use input step like below:

timeout(time: 5, unit: "DAYS") \{

    input message: "Do you want to approve this job to deploy to production?", ok: "OK", submitter: "A,B,C"

}

can not use multi submitter in Blue Ocean UI, but it works fine in the old UI.