I added the following config to the job but all partitions still start simultaneously

{"execution": {
    "config": {
        "multiprocess": {
            "max_concurrent": 1},
    }
}}

the example there limits backfills to 10 concurrently, but you can limit to 1 per backfill with the

applyLimitPerUniqueValue

option

How would one set this up so that only backfills of specific job(s) are serialised?