Update text gadget content

[gjlendrino.tas@gmail.com]

I have added the "Text" gadget to my dashboard and I want to modify its content using the REST API. I haven't found anything in the official documentation. If I do it manually with the browser and enable the DevTools I see that it calls the PUT method of https://myjira/rest/dashboards/1.0/26433/gadget/34273/prefs with the payload:

{ "up_isConfigured": true, "up_title": "a", "up_html": "bb" }

If I navigate to https://myjira/rest/dashboards/1.0/26433/gadget/34273/prefs, it responds:

(Note: changed < with _ due to HTML restrictions in this form)

_?xml version="1.0" encoding="UTF-8" standalone="yes"?>

_userPrefsRepresentation> _action>https://myjira/rest/dashboards/1.0/26433/gadget/34273/prefs_/action>

_fields>

_name>isConfigured_/name>

_value>true_/value>

_type>hidden_/type>

displayName>isConfigured_/displayName>

_required>false_/required>

_/fields>

_fields>

_name>refresh_/name>

_value>false_/value>

_type>hidden_/type>

_displayName>refresh_/displayName>

_required>false_/required>

_/fields>

_fields>

_name>html_/name>

_value>bb_/value>

_type>hidden_/type>

_displayName>html_/displayName>

_required>false_/required>

_/fields>

_fields>

_name>title_/name>

_value>a_/value>

_type>hidden_/type>

_displayName>title_/displayName>

_required>false_/required>

_/fields>

_/userPrefsRepresentation>