Scripted data set

Easy. Just create a scripted data source, then attach a data set to it. Its fetch script would look like:

if (XRowNum == 3) {
    row["KEY"] = '1';
    row["VALUE"] = 'Agenti';
    XRowNum--;
    return true;
}
if (XRowNum == 2) {
    row["KEY"] = '2';
    row["VALUE"] = 'Týmy';
    XRowNum--;
    return true;
}
if (XRowNum == 1) {
    row["KEY"] = '3';
    row["VALUE"] = 'SkillGrupy';
    XRowNum--;
    return true;
}
return false;