This is probably a lot easier than the above character escaping example.
http://api.pma2020.org/v1/datalab/data?
survey=PMA2014_BFR1,PMA2015_BFR2&
characteristicGroup=parity&
overTime=false&
filters=[indicator.label="Unmet need for family planning, spacing (all women)"] <-----
Example syntax - character escaping
Returns data, for 2 surveys, broken down by parity, for all indicators with the name "Unmet need for family planning, spacing (all women)"
Example syntax - support for explicit strings
This is probably a lot easier than the above character escaping example.