How i can find length of each item in a `"mol"`list:

For example if I am looking for `"versionA" : "2.1.2"` I expect ot get following result:

```
{"project" : "A", "scene" : 13455312, mol:[3,2,1]},
{"project" : "B", "scene" : 13455344, mol:[3,3,3]}

```

My data:

```
{
        "project" : "A",
        "scene" : 13455312,
        "versionA" : "2.1.2",
        "versionB" : "2.1.9",
        "mol" : [ {"data" : [ { "tran" : 'A' }, { "tran" : 'B' }, { "tran" : 'C' }]}, {"data" : [ { "tran" : 'A' }, { "tran" : 'B' }]}, {"data" : [ { "tran" : 'A' }]}]
    },

    {
        "project" : "B",
        "scene" : 13455344,
        "versionA" : "2.1.2",
        "versionB" : "2.1.9",
        "mol" : [ {"data" : [ { "tran" : 'A' }, { "tran" : 'B' }, { "tran" : 'C' }]}, {"data" : [ { "tran" : 'A' }, { "tran" : 'B' }, { "tran" : 'C' }]}, {"data" : [ { "tran" : 'A' }, { "tran" : 'B' }, { "tran" : 'C' }]}]
    },
    {
        "project" : "C",
        "scene" : 135555,
        "versionA" : "2.1.3",
        "versionB" : "2.1.9",
        "mol" : [ {"data" : [ { "tran" : 'A' }]}, {"data" : [ { "tran" : 'A' }]}, {"data" : [ { "tran" : 'A' }]}]
    }

```