Snakemake how to map input to output without using dynamic [closed]

Question

I have a pipeline that has a problematic rule. I can't use wildcards in the output, and so I am unable to map the input to the output. The problem is Snakemake launch a job for each one of the combinations. However, I the tool outputs the three required files. I was able to sort the problem with 'dynamic', but I would prefer to

mapping: {'a': ['a_1', 'a_2', 'a_3'], 'b': ['b_1', 'b_2', 'b_3']}


rule build:
    input:
        ini=rules.create_ini.output,
        bam=lambda wildcards:
            expand('mappings/{names}.bam', names=mapping[wildcards.cond],
                cond=wildcards.cond)
    output:
        dynamic('tool/{cond}/{names}.tool')
    params: 
        output='{cond}'
    shell:
        '''
        module load tool
        tool build --conf {input.ini} --output {params.output} # < here
        '''

The tool produces three files, not one and Snakemake is launching six jobs instead two.