Hello @Wiznamo ,
all the variables defined in the variables tab are under the
ctx.vars.yourVariable
Take a look at the out of the box page Sharing form:
Variables:

When you turn on Debug mode you will see the following:
<ctx lang="en" activityHist="@1vHiKVvCNTxiU+K53+Ilqhq5tHUuezMS1lnDAkKV3NFcsjG2Sy2cUmy/9/5OJgtKrlm1hyLP9F1NR846H/1I0=" _folderModel="nmsVisitor" webApp-id="1755" _target="web" date="2022-04-16T16:27:00Z" origin="neolane" score="0">
<userInfo timezone="Europe/Zurich" theme="" orgUnitId="0" noConsoleCnx="true" loginId="1596" loginCS="Web applications agent (webapp)" login="webapp" locale="en-GB" instanceLocale="en-GB" homeDir="" datakitInDatabase="true">
<login-right right="webapp" />
</userInfo>
<vars>
<commentLength>0</commentLength>
<emailPosError>-1</emailPosError>
<bMailInParam>0</bMailInParam>
<deliveryModelName>viral</deliveryModelName>
<bMailInParam_init>0</bMailInParam_init></vars>
<activityHistory>
<activity type="page" name="page" />
</activityHistory>
<captcha>
<_input10 id="@8YdFfnOU1jAVoyc4PjsymSQb0i5PawT6rAxcViEr1YGOjNfPiUva_fmLnOnCZW7T" />
</captcha>
</ctx>
Similar to vars. and instance.vars. in workflows web app use ctx.xxx
Marcel Szimonisz
MarTech Consultant
for more tips visit my blog
https://www.martechnotes.com/