Digi-key sells this part number and has documentation you can download including a Data doc: https://www.digikey.com/en/products/detail/xilinx-inc/XC7A35T-2FGG484C/5039501?utm_adgroup=Integrate...
If the data about capacitance is not listed then it might be a type of data that you can get only after signing some NDA form with AMD.
You can find out starting here: https://community.amd.com/t5/newcomers-start-here/bd-p/newcomer-forum
or by opening a AMD SUPPORT Ticket from here: https://www.amd.com/en/support/contact-email-form
