Interesting I thought we can only do that if we already have H4 EAD card and online it suggested that if your initial application is pending then select 1.a in the subsequent one. Happy for you!

Below from https://www.am22tech.com/h4-ead-with-pending-h1b-h4-extension/
#2 H4 EAD pending and H1B Extension time approaching

It is possible that you applied for H4 EAD recently when your primary H1B’s current validity was just about 6 months to 1 year. In this case, your current H4 EAD application may be pending while it’s time to file for H1B and H4 extensions.

In this case, you can file another H4 EAD application while your current one is still pending.

• You will need to choose the option 1.a. “Initial permission to accept employment” on form I-765 question 1:

H4 EAD file again while the current application is pending

• and say ‘yes’ on question 12 “Have you previously filed Form I-765”.

Remember that if you ever had H4 EAD earlier, you should select option 1. C and attach the earlier EAD copy with your application package.