In case this helps anyone, I only could use the refresh_selection parameter setting it to [] by default. Then, in the notebook, I derived the custom parameter values from the refresh_selection value.
@Manjula_Ganesap how exactly did you format the body in the ADF Web activity? it isn't working for me, I tried with the configuration json object, and also with the parameter directly, but the configuration value isn't overwritten in the dlt pipeline...
