Went digging on Chase's site for the fine print on the benefit. Based on the below I'm interpreting as an e-gift card would count.

1 Elite Credit for Every $5,000 Spent:

You will earn 1 Elite night credit for each $5,000 in Purchases. Purchases are when you, or an authorized user, use a card to make purchases of products and services, minus returns or refunds. Buying products and services with your card, in most cases, will count as a purchase; however, the following types of transactions won't count and won't earn points: balance transfers, cash advances, travelers checks, foreign currency, money orders, wire transfers or similar cash-like transactions, lottery tickets, casino gaming chips, race track wagers or similar betting transactions, any checks that access your account, interest, unauthorized or fraudulent charges, and fees of any kind, including an annual fee, if applicable. We have the right to determine which purchases qualify for this offer. We reserve the right to change or end this offer at any time. There is no limit to the number of Elite nights that you can earn. Please allow up to 8 weeks for Elite nights to be credited to your Marriott Bonvoy® account from the last day of each calendar month you qualify. To qualify for the Elite nights, your account must be open and not in default at the time of processing and fulfillment. Chase is not responsible for offer fulfillment or the provision of or failure to provide the stated benefits and services.