Hi Andrew,
I understand that you are trying to use the 'Fit to Content' tool for your custom blocks. Currently, this option is available for only specific blocks. I myself tried using it with blocks such as the 'S-function' block, but found that the option to use 'Fit to Content' was disabled.
As a workaround, you can manually scale up the size of the block to accommodate the text field accordingly.
Hope this helps!
