How to add three triplets with whole notes in the same bar?

I am trying to convert a Gershwin song using the software by converting a PDF-XML, and there is one bar that is not recognized by my OCR software. I am wondering how can I add this bar in MuseScore 4.
I am not too familiar with the music theory here.

The first three notes are 4 beats, so the software is not allowing me to add the 3 triplets behind it, also how do I add the rest mark above the three whole notes?

first time posting here, really appreciate your help.