I am familiar with
frm.add_fetch("[LINK_FIELD]", "[CORRESPONDING_SOURCE_FIELD]", "[TARGET_FIELD]");
And how it will pull data from another DocType, given a link field value.
The Question is…
my_js_variable for some calculations I wish to undertake? As soon as I am done with the calculations, depending on the result, will I then use:
To set the value of the desired field.