Increase dimension offset from leader

I don't think it's possible.

Information from PTC support:

For Creo Parametric

• If drawing option default_lindim_text_orientation is set to horizontal
• If drawing option default_angdim_text_orientation is set to horizontal
  • drawing option dim_text_gap can be set to control the distance between dimension text and the leader line
• If drawing option default_lindim_text_orientation is set to others
• If drawing option default_angdim_text_orientation is set to others
  • There is no way to control the distance between dimension text and the leader line
  • To request this functionality, refer and vote for Product Idea 5034

Product Idea:

https://community.ptc.com/t5/Creo-Parametric-Ideas/Increasing-gap-between-the-text-and-the-dimension-line/idi-p/458539