Call any field in another field's data

Is it possible to call Any field’s data into another field?

example sonerio.

I am showing TOC using custom fields paragraph on invoice, i want to call Invoice # or Quote number in TOCs.
Or if i create customs field for USD rate and i want to call that USD rate data in multiple places in TOC.

i tried this (example), in TOC custom field,i added this (didnt work)

all prices are based on USD exchange rate {{ custom_fields["usdrate"] }}

where i mention USD exchange rate in customs field named “usdrate”

its just an example, i might want to call quote# on multiple places inside TOC or any other field, is it possible?

Not possible.

You cannot use liquid code in custom fields but you can in a custom theme.

i am already doing it in Custom themes, but if i need to call some data inside TOC, that can be done only calling something in custom fields

What is TOC?

I can’t remember anything in Manager called TOC

sorry, i mean T&C or term and condirtions for invoice, quote etc

i think you didnt understand what i needed in opening post.

@Mian_Waqas_Azfar, if you believe someone has not understood, it is your responsible to explain in more detail. Please do not simply tell them they did not understand.